Document battle arena

7 files changed, 522 insertions, 105 deletions

diff --git a/src/battle_arena.c b/src/battle_arena.c
index 5ab71965b..2d9f82ab6 100644
--- a/src/battle_arena.c
+++ b/src/battle_arena.c
@@ -1,4 +1,5 @@
 #include "global.h"
+#include "battle_arena.h"
 #include "event_data.h"
 #include "palette.h"
 #include "gpu_regs.h"
@@ -19,14 +20,13 @@
 #include "constants/songs.h"
 #include "constants/battle_string_ids.h"
 #include "constants/battle_frontier.h"
+#include "constants/moves.h"
 
 extern u16 gBattle_WIN0H;
 extern u16 gBattle_WIN0V;
 
 extern const u32 gUnknown_08D854E8[];
 extern const u16 gUnknown_08D855E8[];
-extern const struct SpriteTemplate gUnknown_08611F5C;
-extern const s8 gBattleArenaMoveMindRatings[];
 
 // This file's functions.
 static void sub_81A58B4(void);
@@ -36,16 +36,436 @@ static void sub_81A5AC4(void);
 static void sub_81A5B08(void);
 static void sub_81A5B88(void);
 static void sub_81A5BE0(void);
-static void sub_81A5558(u8 x, u8 y, u8 arg2, u8 battler);
+static void SpriteCb_JudgmentIcon(struct Sprite *sprite);
+static void ShowJudgmentSprite(u8 x, u8 y, u8 arg2, u8 battler);
 
 // Const rom data.
+static const s8 sMindRatings[] =
+{
+    [MOVE_NONE] = 0,
+    [MOVE_POUND] = 1,
+    [MOVE_KARATE_CHOP] = 1,
+    [MOVE_DOUBLE_SLAP] = 1,
+    [MOVE_COMET_PUNCH] = 1,
+    [MOVE_MEGA_PUNCH] = 1,
+    [MOVE_PAY_DAY] = 1,
+    [MOVE_FIRE_PUNCH] = 1,
+    [MOVE_ICE_PUNCH] = 1,
+    [MOVE_THUNDER_PUNCH] = 1,
+    [MOVE_SCRATCH] = 1,
+    [MOVE_VICE_GRIP] = 1,
+    [MOVE_GUILLOTINE] = 1,
+    [MOVE_RAZOR_WIND] = 1,
+    [MOVE_SWORDS_DANCE] = 0,
+    [MOVE_CUT] = 1,
+    [MOVE_GUST] = 1,
+    [MOVE_WING_ATTACK] = 1,
+    [MOVE_WHIRLWIND] = 0,
+    [MOVE_FLY] = 1,
+    [MOVE_BIND] = 1,
+    [MOVE_SLAM] = 1,
+    [MOVE_VINE_WHIP] = 1,
+    [MOVE_STOMP] = 1,
+    [MOVE_DOUBLE_KICK] = 1,
+    [MOVE_MEGA_KICK] = 1,
+    [MOVE_JUMP_KICK] = 1,
+    [MOVE_ROLLING_KICK] = 1,
+    [MOVE_SAND_ATTACK] = 0,
+    [MOVE_HEADBUTT] = 1,
+    [MOVE_HORN_ATTACK] = 1,
+    [MOVE_FURY_ATTACK] = 1,
+    [MOVE_HORN_DRILL] = 1,
+    [MOVE_TACKLE] = 1,
+    [MOVE_BODY_SLAM] = 1,
+    [MOVE_WRAP] = 1,
+    [MOVE_TAKE_DOWN] = 1,
+    [MOVE_THRASH] = 1,
+    [MOVE_DOUBLE_EDGE] = 1,
+    [MOVE_TAIL_WHIP] = 0,
+    [MOVE_POISON_STING] = 1,
+    [MOVE_TWINEEDLE] = 1,
+    [MOVE_PIN_MISSILE] = 1,
+    [MOVE_LEER] = 0,
+    [MOVE_BITE] = 1,
+    [MOVE_GROWL] = 0,
+    [MOVE_ROAR] = 0,
+    [MOVE_SING] = 0,
+    [MOVE_SUPERSONIC] = 0,
+    [MOVE_SONIC_BOOM] = 1,
+    [MOVE_DISABLE] = 0,
+    [MOVE_ACID] = 1,
+    [MOVE_EMBER] = 1,
+    [MOVE_FLAMETHROWER] = 1,
+    [MOVE_MIST] = 0,
+    [MOVE_WATER_GUN] = 1,
+    [MOVE_HYDRO_PUMP] = 1,
+    [MOVE_SURF] = 1,
+    [MOVE_ICE_BEAM] = 1,
+    [MOVE_BLIZZARD] = 1,
+    [MOVE_PSYBEAM] = 1,
+    [MOVE_BUBBLE_BEAM] = 1,
+    [MOVE_AURORA_BEAM] = 1,
+    [MOVE_HYPER_BEAM] = 1,
+    [MOVE_PECK] = 1,
+    [MOVE_DRILL_PECK] = 1,
+    [MOVE_SUBMISSION] = 1,
+    [MOVE_LOW_KICK] = 1,
+    [MOVE_COUNTER] = 0,
+    [MOVE_SEISMIC_TOSS] = 1,
+    [MOVE_STRENGTH] = 1,
+    [MOVE_ABSORB] = 1,
+    [MOVE_MEGA_DRAIN] = 1,
+    [MOVE_LEECH_SEED] = 0,
+    [MOVE_GROWTH] = 0,
+    [MOVE_RAZOR_LEAF] = 1,
+    [MOVE_SOLAR_BEAM] = 1,
+    [MOVE_POISON_POWDER] = 0,
+    [MOVE_STUN_SPORE] = 0,
+    [MOVE_SLEEP_POWDER] = 0,
+    [MOVE_PETAL_DANCE] = 1,
+    [MOVE_STRING_SHOT] = 0,
+    [MOVE_DRAGON_RAGE] = 1,
+    [MOVE_FIRE_SPIN] = 1,
+    [MOVE_THUNDER_SHOCK] = 1,
+    [MOVE_THUNDERBOLT] = 1,
+    [MOVE_THUNDER_WAVE] = 0,
+    [MOVE_THUNDER] = 1,
+    [MOVE_ROCK_THROW] = 1,
+    [MOVE_EARTHQUAKE] = 1,
+    [MOVE_FISSURE] = 1,
+    [MOVE_DIG] = 1,
+    [MOVE_TOXIC] = 0,
+    [MOVE_CONFUSION] = 1,
+    [MOVE_PSYCHIC] = 1,
+    [MOVE_HYPNOSIS] = 0,
+    [MOVE_MEDITATE] = 0,
+    [MOVE_AGILITY] = 0,
+    [MOVE_QUICK_ATTACK] = 1,
+    [MOVE_RAGE] = 1,
+    [MOVE_TELEPORT] = 0,
+    [MOVE_NIGHT_SHADE] = 1,
+    [MOVE_MIMIC] = 0,
+    [MOVE_SCREECH] = 0,
+    [MOVE_DOUBLE_TEAM] = 0,
+    [MOVE_RECOVER] = 0,
+    [MOVE_HARDEN] = 0,
+    [MOVE_MINIMIZE] = 0,
+    [MOVE_SMOKESCREEN] = 0,
+    [MOVE_CONFUSE_RAY] = 0,
+    [MOVE_WITHDRAW] = 0,
+    [MOVE_DEFENSE_CURL] = 0,
+    [MOVE_BARRIER] = 0,
+    [MOVE_LIGHT_SCREEN] = 0,
+    [MOVE_HAZE] = 0,
+    [MOVE_REFLECT] = 0,
+    [MOVE_FOCUS_ENERGY] = 0,
+    [MOVE_BIDE] = 0,
+    [MOVE_METRONOME] = 0,
+    [MOVE_MIRROR_MOVE] = 0,
+    [MOVE_SELF_DESTRUCT] = 1,
+    [MOVE_EGG_BOMB] = 1,
+    [MOVE_LICK] = 1,
+    [MOVE_SMOG] = 1,
+    [MOVE_SLUDGE] = 1,
+    [MOVE_BONE_CLUB] = 1,
+    [MOVE_FIRE_BLAST] = 1,
+    [MOVE_WATERFALL] = 1,
+    [MOVE_CLAMP] = 1,
+    [MOVE_SWIFT] = 1,
+    [MOVE_SKULL_BASH] = 1,
+    [MOVE_SPIKE_CANNON] = 1,
+    [MOVE_CONSTRICT] = 1,
+    [MOVE_AMNESIA] = 0,
+    [MOVE_KINESIS] = 0,
+    [MOVE_SOFT_BOILED] = 0,
+    [MOVE_HI_JUMP_KICK] = 1,
+    [MOVE_GLARE] = 0,
+    [MOVE_DREAM_EATER] = 1,
+    [MOVE_POISON_GAS] = 0,
+    [MOVE_BARRAGE] = 1,
+    [MOVE_LEECH_LIFE] = 1,
+    [MOVE_LOVELY_KISS] = 0,
+    [MOVE_SKY_ATTACK] = 1,
+    [MOVE_TRANSFORM] = 0,
+    [MOVE_BUBBLE] = 1,
+    [MOVE_DIZZY_PUNCH] = 1,
+    [MOVE_SPORE] = 0,
+    [MOVE_FLASH] = 0,
+    [MOVE_PSYWAVE] = 1,
+    [MOVE_SPLASH] = 0,
+    [MOVE_ACID_ARMOR] = 0,
+    [MOVE_CRABHAMMER] = 1,
+    [MOVE_EXPLOSION] = 1,
+    [MOVE_FURY_SWIPES] = 1,
+    [MOVE_BONEMERANG] = 1,
+    [MOVE_REST] = 0,
+    [MOVE_ROCK_SLIDE] = 1,
+    [MOVE_HYPER_FANG] = 1,
+    [MOVE_SHARPEN] = 0,
+    [MOVE_CONVERSION] = 0,
+    [MOVE_TRI_ATTACK] = 1,
+    [MOVE_SUPER_FANG] = 1,
+    [MOVE_SLASH] = 1,
+    [MOVE_SUBSTITUTE] = 0,
+    [MOVE_STRUGGLE] = 1,
+    [MOVE_SKETCH] = 0,
+    [MOVE_TRIPLE_KICK] = 1,
+    [MOVE_THIEF] = 1,
+    [MOVE_SPIDER_WEB] = 0,
+    [MOVE_MIND_READER] = 0,
+    [MOVE_NIGHTMARE] = 0,
+    [MOVE_FLAME_WHEEL] = 1,
+    [MOVE_SNORE] = 1,
+    [MOVE_CURSE] = 0,
+    [MOVE_FLAIL] = 1,
+    [MOVE_CONVERSION_2] = 0,
+    [MOVE_AEROBLAST] = 1,
+    [MOVE_COTTON_SPORE] = 0,
+    [MOVE_REVERSAL] = 1,
+    [MOVE_SPITE] = 0,
+    [MOVE_POWDER_SNOW] = 1,
+    [MOVE_PROTECT] = -1,
+    [MOVE_MACH_PUNCH] = 1,
+    [MOVE_SCARY_FACE] = 0,
+    [MOVE_FAINT_ATTACK] = 1,
+    [MOVE_SWEET_KISS] = 0,
+    [MOVE_BELLY_DRUM] = 0,
+    [MOVE_SLUDGE_BOMB] = 1,
+    [MOVE_MUD_SLAP] = 1,
+    [MOVE_OCTAZOOKA] = 1,
+    [MOVE_SPIKES] = 0,
+    [MOVE_ZAP_CANNON] = 1,
+    [MOVE_FORESIGHT] = 0,
+    [MOVE_DESTINY_BOND] = 0,
+    [MOVE_PERISH_SONG] = 0,
+    [MOVE_ICY_WIND] = 1,
+    [MOVE_DETECT] = -1,
+    [MOVE_BONE_RUSH] = 1,
+    [MOVE_LOCK_ON] = 0,
+    [MOVE_OUTRAGE] = 1,
+    [MOVE_SANDSTORM] = 0,
+    [MOVE_GIGA_DRAIN] = 1,
+    [MOVE_ENDURE] = -1,
+    [MOVE_CHARM] = 0,
+    [MOVE_ROLLOUT] = 1,
+    [MOVE_FALSE_SWIPE] = 1,
+    [MOVE_SWAGGER] = 0,
+    [MOVE_MILK_DRINK] = 0,
+    [MOVE_SPARK] = 1,
+    [MOVE_FURY_CUTTER] = 1,
+    [MOVE_STEEL_WING] = 1,
+    [MOVE_MEAN_LOOK] = 0,
+    [MOVE_ATTRACT] = 0,
+    [MOVE_SLEEP_TALK] = 0,
+    [MOVE_HEAL_BELL] = 0,
+    [MOVE_RETURN] = 1,
+    [MOVE_PRESENT] = 1,
+    [MOVE_FRUSTRATION] = 1,
+    [MOVE_SAFEGUARD] = 0,
+    [MOVE_PAIN_SPLIT] = 0,
+    [MOVE_SACRED_FIRE] = 1,
+    [MOVE_MAGNITUDE] = 1,
+    [MOVE_DYNAMIC_PUNCH] = 1,
+    [MOVE_MEGAHORN] = 1,
+    [MOVE_DRAGON_BREATH] = 1,
+    [MOVE_BATON_PASS] = 0,
+    [MOVE_ENCORE] = 0,
+    [MOVE_PURSUIT] = 1,
+    [MOVE_RAPID_SPIN] = 1,
+    [MOVE_SWEET_SCENT] = 0,
+    [MOVE_IRON_TAIL] = 1,
+    [MOVE_METAL_CLAW] = 1,
+    [MOVE_VITAL_THROW] = 1,
+    [MOVE_MORNING_SUN] = 0,
+    [MOVE_SYNTHESIS] = 0,
+    [MOVE_MOONLIGHT] = 0,
+    [MOVE_HIDDEN_POWER] = 1,
+    [MOVE_CROSS_CHOP] = 1,
+    [MOVE_TWISTER] = 1,
+    [MOVE_RAIN_DANCE] = 0,
+    [MOVE_SUNNY_DAY] = 0,
+    [MOVE_CRUNCH] = 1,
+    [MOVE_MIRROR_COAT] = 0,
+    [MOVE_PSYCH_UP] = 0,
+    [MOVE_EXTREME_SPEED] = 1,
+    [MOVE_ANCIENT_POWER] = 1,
+    [MOVE_SHADOW_BALL] = 1,
+    [MOVE_FUTURE_SIGHT] = 1,
+    [MOVE_ROCK_SMASH] = 1,
+    [MOVE_WHIRLPOOL] = 1,
+    [MOVE_BEAT_UP] = 1,
+    [MOVE_FAKE_OUT] = -1,
+    [MOVE_UPROAR] = 1,
+    [MOVE_STOCKPILE] = 0,
+    [MOVE_SPIT_UP] = 1,
+    [MOVE_SWALLOW] = 0,
+    [MOVE_HEAT_WAVE] = 1,
+    [MOVE_HAIL] = 0,
+    [MOVE_TORMENT] = 0,
+    [MOVE_FLATTER] = 0,
+    [MOVE_WILL_O_WISP] = 0,
+    [MOVE_MEMENTO] = 0,
+    [MOVE_FACADE] = 1,
+    [MOVE_FOCUS_PUNCH] = 1,
+    [MOVE_SMELLING_SALT] = 1,
+    [MOVE_FOLLOW_ME] = 0,
+    [MOVE_NATURE_POWER] = 0,
+    [MOVE_CHARGE] = 0,
+    [MOVE_TAUNT] = 0,
+    [MOVE_HELPING_HAND] = 0,
+    [MOVE_TRICK] = 0,
+    [MOVE_ROLE_PLAY] = 0,
+    [MOVE_WISH] = 0,
+    [MOVE_ASSIST] = 0,
+    [MOVE_INGRAIN] = 0,
+    [MOVE_SUPERPOWER] = 1,
+    [MOVE_MAGIC_COAT] = 0,
+    [MOVE_RECYCLE] = 0,
+    [MOVE_REVENGE] = 1,
+    [MOVE_BRICK_BREAK] = 1,
+    [MOVE_YAWN] = 0,
+    [MOVE_KNOCK_OFF] = 1,
+    [MOVE_ENDEAVOR] = 1,
+    [MOVE_ERUPTION] = 1,
+    [MOVE_SKILL_SWAP] = 0,
+    [MOVE_IMPRISON] = 0,
+    [MOVE_REFRESH] = 0,
+    [MOVE_GRUDGE] = 0,
+    [MOVE_SNATCH] = 0,
+    [MOVE_SECRET_POWER] = 1,
+    [MOVE_DIVE] = 1,
+    [MOVE_ARM_THRUST] = 1,
+    [MOVE_CAMOUFLAGE] = 0,
+    [MOVE_TAIL_GLOW] = 0,
+    [MOVE_LUSTER_PURGE] = 1,
+    [MOVE_MIST_BALL] = 1,
+    [MOVE_FEATHER_DANCE] = 0,
+    [MOVE_TEETER_DANCE] = 0,
+    [MOVE_BLAZE_KICK] = 1,
+    [MOVE_MUD_SPORT] = 0,
+    [MOVE_ICE_BALL] = 1,
+    [MOVE_NEEDLE_ARM] = 1,
+    [MOVE_SLACK_OFF] = 0,
+    [MOVE_HYPER_VOICE] = 1,
+    [MOVE_POISON_FANG] = 1,
+    [MOVE_CRUSH_CLAW] = 1,
+    [MOVE_BLAST_BURN] = 1,
+    [MOVE_HYDRO_CANNON] = 1,
+    [MOVE_METEOR_MASH] = 1,
+    [MOVE_ASTONISH] = 1,
+    [MOVE_WEATHER_BALL] = 1,
+    [MOVE_AROMATHERAPY] = 0,
+    [MOVE_FAKE_TEARS] = 0,
+    [MOVE_AIR_CUTTER] = 1,
+    [MOVE_OVERHEAT] = 1,
+    [MOVE_ODOR_SLEUTH] = 0,
+    [MOVE_ROCK_TOMB] = 1,
+    [MOVE_SILVER_WIND] = 1,
+    [MOVE_METAL_SOUND] = 0,
+    [MOVE_GRASS_WHISTLE] = 0,
+    [MOVE_TICKLE] = 0,
+    [MOVE_COSMIC_POWER] = 0,
+    [MOVE_WATER_SPOUT] = 1,
+    [MOVE_SIGNAL_BEAM] = 1,
+    [MOVE_SHADOW_PUNCH] = 1,
+    [MOVE_EXTRASENSORY] = 1,
+    [MOVE_SKY_UPPERCUT] = 1,
+    [MOVE_SAND_TOMB] = 1,
+    [MOVE_SHEER_COLD] = 1,
+    [MOVE_MUDDY_WATER] = 1,
+    [MOVE_BULLET_SEED] = 1,
+    [MOVE_AERIAL_ACE] = 1,
+    [MOVE_ICICLE_SPEAR] = 1,
+    [MOVE_IRON_DEFENSE] = 0,
+    [MOVE_BLOCK] = 0,
+    [MOVE_HOWL] = 0,
+    [MOVE_DRAGON_CLAW] = 1,
+    [MOVE_FRENZY_PLANT] = 1,
+    [MOVE_BULK_UP] = 0,
+    [MOVE_BOUNCE] = 1,
+    [MOVE_MUD_SHOT] = 1,
+    [MOVE_POISON_TAIL] = 1,
+    [MOVE_COVET] = 1,
+    [MOVE_VOLT_TACKLE] = 1,
+    [MOVE_MAGICAL_LEAF] = 1,
+    [MOVE_WATER_SPORT] = 0,
+    [MOVE_CALM_MIND] = 0,
+    [MOVE_LEAF_BLADE] = 1,
+    [MOVE_DRAGON_DANCE] = 0,
+    [MOVE_ROCK_BLAST] = 1,
+    [MOVE_SHOCK_WAVE] = 1,
+    [MOVE_WATER_PULSE] = 1,
+    [MOVE_DOOM_DESIRE] = 1,
+    [MOVE_PSYCHO_BOOST] = 1,
+};
+
+static const struct OamData sOamData_8611F24 =
+{
+    .y = 0,
+    .affineMode = 0,
+    .objMode = 0,
+    .mosaic = 0,
+    .bpp = 0,
+    .shape = 0,
+    .x = 0,
+    .matrixNum = 0,
+    .size = 1,
+    .tileNum = 0,
+    .priority = 0,
+    .paletteNum = 15,
+    .affineParam = 0
+};
+
+static const union AnimCmd sSpriteAnim_8611F2C[] =
+{
+    ANIMCMD_FRAME(0, 1),
+    ANIMCMD_END
+};
+
+static const union AnimCmd sSpriteAnim_8611F34[] =
+{
+    ANIMCMD_FRAME(4, 1),
+    ANIMCMD_END
+};
+
+static const union AnimCmd sSpriteAnim_8611F3C[] =
+{
+    ANIMCMD_FRAME(8, 1),
+    ANIMCMD_END
+};
+
+static const union AnimCmd sSpriteAnim_8611F44[] =
+{
+    ANIMCMD_FRAME(12, 1),
+    ANIMCMD_END
+};
+
+static const union AnimCmd *const sSpriteAnimTable_8611F4C[] =
+{
+    sSpriteAnim_8611F2C,
+    sSpriteAnim_8611F34,
+    sSpriteAnim_8611F3C,
+    sSpriteAnim_8611F44
+};
+
+static const struct SpriteTemplate sSpriteTemplate_JudgmentIcon =
+{
+    .tileTag = 0x3E8,
+    .paletteTag = 0xFFFF,
+    .oam = &sOamData_8611F24,
+    .anims = sSpriteAnimTable_8611F4C,
+    .images = NULL,
+    .affineAnims = gDummySpriteAffineAnimTable,
+    .callback = SpriteCb_JudgmentIcon,
+};
+
 static const struct CompressedSpriteSheet gUnknown_08611F74[] =
 {
     {gUnknown_08D854E8, 0x200, 0x3E8},
     {0}
 };
 
-static void (* const gUnknown_08611F84[])(void) =
+static void (* const sArenaFunctions[])(void) =
 {
     sub_81A58B4,
     sub_81A5964,
@@ -69,10 +489,10 @@ static const u16 gUnknown_08611FAC[9] =
 // code
 void CallBattleArenaFunction(void)
 {
-    gUnknown_08611F84[gSpecialVar_0x8004]();
+    sArenaFunctions[gSpecialVar_0x8004]();
 }
 
-u8 sub_81A5258(u8 *state)
+u8 BattleArena_ShowJudgmentWindow(u8 *state)
 {
     s32 i;
     u8 ret = 0;
@@ -120,7 +540,7 @@ u8 sub_81A5258(u8 *state)
             SetGpuReg(REG_OFFSET_WININ, WININ_WIN0_BG_ALL | WININ_WIN0_OBJ | WININ_WIN0_CLR | WININ_WIN1_BG_ALL | WININ_WIN1_OBJ | WININ_WIN1_CLR);
             for (i = 0; i < 8; i++)
             {
-                u8 spriteId = CreateSprite(&gUnknown_08611F5C, 0x40 + (i * 0x10), 84, 0);
+                u8 spriteId = CreateSprite(&sSpriteTemplate_JudgmentIcon, 0x40 + (i * 0x10), 84, 0);
                 StartSpriteAnim(&gSprites[spriteId], 3);
             }
             ret = 1;
@@ -129,8 +549,8 @@ u8 sub_81A5258(u8 *state)
         break;
     case 4:
         PlaySE(SE_HANTEI1);
-        sub_81A5558(80, 40, 0, 0);
-        sub_81A5558(160, 40, 0, 1);
+        ShowJudgmentSprite(80, 40, 0, 0);
+        ShowJudgmentSprite(160, 40, 0, 1);
         BattleStringExpandPlaceholdersToDisplayedString(gText_Judgement);
         BattlePutTextOnWindow(gDisplayedStringBattle, 21);
         (*state)++;
@@ -138,8 +558,8 @@ u8 sub_81A5258(u8 *state)
         break;
     case 5:
         PlaySE(SE_HANTEI1);
-        sub_81A5558(80, 56, 1, 0);
-        sub_81A5558(160, 56, 1, 1);
+        ShowJudgmentSprite(80, 56, 1, 0);
+        ShowJudgmentSprite(160, 56, 1, 1);
         BattleStringExpandPlaceholdersToDisplayedString(gText_Judgement);
         BattlePutTextOnWindow(gDisplayedStringBattle, 21);
         (*state)++;
@@ -147,8 +567,8 @@ u8 sub_81A5258(u8 *state)
         break;
     case 6:
         PlaySE(SE_HANTEI1);
-        sub_81A5558(80, 72, 2, 0);
-        sub_81A5558(160, 72, 2, 1);
+        ShowJudgmentSprite(80, 72, 2, 0);
+        ShowJudgmentSprite(160, 72, 2, 1);
         BattleStringExpandPlaceholdersToDisplayedString(gText_Judgement);
         BattlePutTextOnWindow(gDisplayedStringBattle, 21);
         (*state)++;
@@ -197,32 +617,32 @@ u8 sub_81A5258(u8 *state)
     return ret;
 }
 
-static void sub_81A5558(u8 x, u8 y, u8 arg2, u8 battler)
+static void ShowJudgmentSprite(u8 x, u8 y, u8 category, u8 battler)
 {
     s32 animNum = 0;
-    s32 r6 = 0;
-    s32 r1 = 0;
-    s8 *ptr1 = gBattleStruct->field_298;
-    s8 *ptr2 = gBattleStruct->field_29A;
-    u16 *ptr3 = gBattleStruct->field_29C;
+    s32 pointsPlayer = 0;
+    s32 pointsOpponent = 0;
+    s8 *mindPoints = gBattleStruct->arenaMindPoints;
+    s8 *skillPoints = gBattleStruct->arenaSkillPoints;
+    u16 *hpAtStart = gBattleStruct->arenaStartHp;
 
-    switch (arg2)
+    switch (category)
     {
     case 0:
-        r6 = ptr1[battler];
-        r1 = ptr1[BATTLE_OPPOSITE(battler)];
+        pointsPlayer = mindPoints[battler];
+        pointsOpponent = mindPoints[BATTLE_OPPOSITE(battler)];
         break;
     case 1:
-        r6 = ptr2[battler];
-        r1 = ptr2[BATTLE_OPPOSITE(battler)];
+        pointsPlayer = skillPoints[battler];
+        pointsOpponent = skillPoints[BATTLE_OPPOSITE(battler)];
         break;
     case 2:
-        r6 = (gBattleMons[battler].hp * 100) / ptr3[battler];
-        r1 = (gBattleMons[BATTLE_OPPOSITE(battler)].hp * 100) / ptr3[BATTLE_OPPOSITE(battler)];
+        pointsPlayer = (gBattleMons[battler].hp * 100) / hpAtStart[battler];
+        pointsOpponent = (gBattleMons[BATTLE_OPPOSITE(battler)].hp * 100) / hpAtStart[BATTLE_OPPOSITE(battler)];
         break;
     }
 
-    if (r6 > r1)
+    if (pointsPlayer > pointsOpponent)
     {
         animNum = 2;
         if (battler != 0)
@@ -230,7 +650,7 @@ static void sub_81A5558(u8 x, u8 y, u8 arg2, u8 battler)
         else
             gBattleTextBuff1[0] += 2;
     }
-    else if (r6 == r1)
+    else if (pointsPlayer == pointsOpponent)
     {
         animNum = 1;
         if (battler != 0)
@@ -243,76 +663,76 @@ static void sub_81A5558(u8 x, u8 y, u8 arg2, u8 battler)
         animNum = 0;
     }
 
-    r6 = CreateSprite(&gUnknown_08611F5C, x, y, 0);
-    StartSpriteAnim(&gSprites[r6], animNum);
+    pointsPlayer = CreateSprite(&sSpriteTemplate_JudgmentIcon, x, y, 0);
+    StartSpriteAnim(&gSprites[pointsPlayer], animNum);
 }
 
-void sub_81A5698(struct Sprite *sprite)
+static void SpriteCb_JudgmentIcon(struct Sprite *sprite)
 {
     if (gBattleCommunication[0] > 8)
         DestroySprite(sprite);
 }
 
-void sub_81A56B4(void)
+void BattleArena_InitPoints(void)
 {
-    s8 *ptr1 = gBattleStruct->field_298;
-    s8 *ptr2 = gBattleStruct->field_29A;
-    u16 *ptr3 = gBattleStruct->field_29C;
-
-    ptr1[0] = 0;
-    ptr1[1] = 0;
-    ptr2[0] = 0;
-    ptr2[1] = 0;
-    ptr3[0] = gBattleMons[0].hp;
-    ptr3[1] = gBattleMons[1].hp;
+    s8 *mindPoints = gBattleStruct->arenaMindPoints;
+    s8 *skillPoints = gBattleStruct->arenaSkillPoints;
+    u16 *hpAtStart = gBattleStruct->arenaStartHp;
+
+    mindPoints[0] = 0;
+    mindPoints[1] = 0;
+    skillPoints[0] = 0;
+    skillPoints[1] = 0;
+    hpAtStart[0] = gBattleMons[0].hp;
+    hpAtStart[1] = gBattleMons[1].hp;
 }
 
-void sub_81A56E8(u8 battler)
+void BattleArena_AddMindPoints(u8 battler)
 {
-    s8 *ptr1 = gBattleStruct->field_298;
+    s8 *mindPoints = gBattleStruct->arenaMindPoints;
 
-    ptr1[battler] += gBattleArenaMoveMindRatings[gCurrentMove];
+    mindPoints[battler] += sMindRatings[gCurrentMove];
 }
 
-void sub_81A5718(u8 battler)
+void BattleArena_AddSkillPoints(u8 battler)
 {
-    s8 *ptr2 = gBattleStruct->field_29A;
+    s8 *skillPoints = gBattleStruct->arenaSkillPoints;
 
     if (gHitMarker & HITMARKER_OBEYS)
     {
-        u8 *ptr4 = &gBattleStruct->field_2A2;
-        if (*ptr4 & gBitTable[battler])
+        u8 *failedMoveBits = &gBattleStruct->alreadyStatusedMoveAttempt;
+        if (*failedMoveBits & gBitTable[battler])
         {
-            *ptr4 &= ~(gBitTable[battler]);
-            ptr2[battler] -= 2;
+            *failedMoveBits &= ~(gBitTable[battler]);
+            skillPoints[battler] -= 2;
         }
         else if (gMoveResultFlags & MOVE_RESULT_NO_EFFECT)
         {
             if (!(gMoveResultFlags & MOVE_RESULT_MISSED) || gBattleCommunication[6] != 1)
-                ptr2[battler] -= 2;
+                skillPoints[battler] -= 2;
         }
         else if (gMoveResultFlags & MOVE_RESULT_SUPER_EFFECTIVE && gMoveResultFlags & MOVE_RESULT_NOT_VERY_EFFECTIVE)
         {
-            ptr2[battler] += 1;
+            skillPoints[battler] += 1;
         }
         else if (gMoveResultFlags & MOVE_RESULT_SUPER_EFFECTIVE)
         {
-            ptr2[battler] += 2;
+            skillPoints[battler] += 2;
         }
         else if (gMoveResultFlags & MOVE_RESULT_NOT_VERY_EFFECTIVE)
         {
-            ptr2[battler] -= 1;
+            skillPoints[battler] -= 1;
         }
         else if (!gProtectStructs[battler].protected)
         {
-            ptr2[battler] += 1;
+            skillPoints[battler] += 1;
         }
     }
 }
 
-void sub_81A57E4(u8 battler, u16 stringId)
+void BattleArena_DeductMindPoints(u8 battler, u16 stringId)
 {
-    s8 *ptr2 = gBattleStruct->field_29A;
+    s8 *skillPoints = gBattleStruct->arenaSkillPoints;
 
     switch (stringId)
     {
@@ -335,18 +755,18 @@ void sub_81A57E4(u8 battler, u16 stringId)
     case STRINGID_PKMNANCHORSITSELFWITH:
     case STRINGID_PKMNPREVENTSSTATLOSSWITH:
     case STRINGID_PKMNSTAYEDAWAKEUSING:
-        ptr2[battler] -= 3;
+        skillPoints[battler] -= 3;
         break;
     }
 }
 
-void sub_81A586C(u8 battler)
+void sub_81A586C(u8 battler) // Unused.
 {
-    u16 *ptr3 = gBattleStruct->field_29C;
+    u16 *hpAtStart = gBattleStruct->arenaStartHp;
 
-    ptr3[battler] = gBattleMons[battler].hp;
-    if (ptr3[BATTLE_OPPOSITE(battler)] > gBattleMons[BATTLE_OPPOSITE(battler)].hp)
-        ptr3[BATTLE_OPPOSITE(battler)] = gBattleMons[BATTLE_OPPOSITE(battler)].hp;
+    hpAtStart[battler] = gBattleMons[battler].hp;
+    if (hpAtStart[BATTLE_OPPOSITE(battler)] > gBattleMons[BATTLE_OPPOSITE(battler)].hp)
+        hpAtStart[BATTLE_OPPOSITE(battler)] = gBattleMons[BATTLE_OPPOSITE(battler)].hp;
 }
 
 static void sub_81A58B4(void)
diff --git a/src/battle_controller_opponent.c b/src/battle_controller_opponent.c
index b8b5bd3b8..2629a56c0 100644
--- a/src/battle_controller_opponent.c
+++ b/src/battle_controller_opponent.c
@@ -29,6 +29,9 @@
 #include "pokeball.h"
 #include "data2.h"
 #include "battle_setup.h"
+#include "battle_arena.h"
+#include "battle_tower.h"
+#include "frontier_util.h"
 
 extern u16 gBattle_BG0_X;
 extern u16 gBattle_BG0_Y;
@@ -38,11 +41,7 @@ extern struct UnusedControllerStruct gUnknown_02022D0C;
 extern const struct CompressedSpritePalette gTrainerFrontPicPaletteTable[];
 
 extern void sub_8172EF0(u8 battlerId, struct Pokemon *mon);
-extern void sub_81A57E4(u8 battlerId, u16 stringId);
-extern u8 GetFrontierBrainTrainerPicIndex(void);
 extern u8 GetTrainerHillTrainerFrontSpriteId(u16 trainerId);
-extern u8 GetFrontierTrainerFrontSpriteId(u16 trainerId);
-extern u8 GetEreaderTrainerFrontSpriteId(void);
 
 // this file's functions
 static void OpponentHandleGetMonData(void);
@@ -1513,7 +1512,7 @@ static void OpponentHandlePrintString(void)
     BufferStringBattle(*stringId);
     BattlePutTextOnWindow(gDisplayedStringBattle, 0);
     gBattlerControllerFuncs[gActiveBattler] = CompleteOnInactiveTextPrinter;
-    sub_81A57E4(gActiveBattler, *stringId);
+    BattleArena_DeductMindPoints(gActiveBattler, *stringId);
 }
 
 static void OpponentHandlePrintSelectionString(void)
diff --git a/src/battle_controller_player.c b/src/battle_controller_player.c
index 6bc6c6f49..20781ca44 100644
--- a/src/battle_controller_player.c
+++ b/src/battle_controller_player.c
@@ -32,6 +32,7 @@
 #include "recorded_battle.h"
 #include "party_menu.h"
 #include "battle_dome.h"
+#include "battle_arena.h"
 
 extern u8 gUnknown_0203CEE8;
 extern u8 gUnknown_0203CEE9;
@@ -46,7 +47,6 @@ extern const struct CompressedSpritePalette gTrainerBackPicPaletteTable[];
 
 extern void sub_8172EF0(u8 battlerId, struct Pokemon *mon);
 extern void sub_81AABB0(void);
-extern void sub_81A57E4(u8 battlerId, u16 stringId);
 extern void sub_81851A8(u8 *);
 
 // this file's functions
@@ -2537,7 +2537,7 @@ static void PlayerHandlePrintString(void)
     BattlePutTextOnWindow(gDisplayedStringBattle, 0);
     gBattlerControllerFuncs[gActiveBattler] = CompleteOnInactiveTextPrinter2;
     BattleTv_SetDataBasedOnString(*stringId);
-    sub_81A57E4(gActiveBattler, *stringId);
+    BattleArena_DeductMindPoints(gActiveBattler, *stringId);
 }
 
 static void PlayerHandlePrintSelectionString(void)
@@ -2600,9 +2600,11 @@ static void HandleChooseMoveAfterDma3(void)
     }
 }
 
+// arenaMindPoints is used here as a placeholder for a timer.
+
 static void PlayerChooseMoveInBattlePalace(void)
 {
-    if (--*(gBattleStruct->field_298 + gActiveBattler) == 0)
+    if (--*(gBattleStruct->arenaMindPoints + gActiveBattler) == 0)
     {
         gBattlePalaceMoveSelectionRngValue = gRngValue;
         BtlController_EmitTwoReturnValues(1, 10, ChooseMoveAndTargetInBattlePalace());
@@ -2614,7 +2616,7 @@ static void PlayerHandleChooseMove(void)
 {
     if (gBattleTypeFlags & BATTLE_TYPE_PALACE)
     {
-        *(gBattleStruct->field_298 + gActiveBattler) = 8;
+        *(gBattleStruct->arenaMindPoints + gActiveBattler) = 8;
         gBattlerControllerFuncs[gActiveBattler] = PlayerChooseMoveInBattlePalace;
     }
     else
diff --git a/src/battle_interface.c b/src/battle_interface.c
index d89d6164d..ec8a06094 100644
--- a/src/battle_interface.c
+++ b/src/battle_interface.c
@@ -1610,7 +1610,7 @@ u8 CreatePartyStatusSummarySprites(u8 battlerId, struct HpAndStatus *partyInfo,
                 {
                     gSprites[ballIconSpritesIds[i]].oam.tileNum += 3;
                 }
-                else if (gBattleTypeFlags & BATTLE_TYPE_ARENA && gBattleStruct->field_2A0 & gBitTable[j]) // hmm...?
+                else if (gBattleTypeFlags & BATTLE_TYPE_ARENA && gBattleStruct->arenaLostPlayerMons & gBitTable[j])
                 {
                     gSprites[ballIconSpritesIds[i]].oam.tileNum += 3;
                 }
@@ -1659,7 +1659,7 @@ u8 CreatePartyStatusSummarySprites(u8 battlerId, struct HpAndStatus *partyInfo,
                 {
                     gSprites[ballIconSpritesIds[5 - var]].oam.tileNum += 3;
                 }
-                else if (gBattleTypeFlags & BATTLE_TYPE_ARENA && gBattleStruct->field_2A1 & gBitTable[j]) // hmm...?
+                else if (gBattleTypeFlags & BATTLE_TYPE_ARENA && gBattleStruct->arenaLostOpponentMons & gBitTable[j]) // hmm...?
                 {
                     gSprites[ballIconSpritesIds[5 - var]].oam.tileNum += 3;
                 }
diff --git a/src/battle_main.c b/src/battle_main.c
index e08e12194..5fcdb29d1 100644
--- a/src/battle_main.c
+++ b/src/battle_main.c
@@ -53,6 +53,7 @@
 #include "pokeball.h"
 #include "party_menu.h"
 #include "battle_tower.h"
+#include "battle_arena.h"
 
 struct UnknownPokemonStruct4
 {
@@ -109,9 +110,7 @@ extern const u8 gText_Love[];
 // functions
 extern void sub_81B9150(void);
 extern void sub_80B3AF8(u8 taskId); // cable club
-extern void sub_81A56B4(void); // battle frontier 2
 extern u8 sub_81A9E28(void); // battle frontier 2
-extern void sub_81A56E8(u8 battlerId); // battle frontier 2
 extern void sub_81B8FB0(u8, u8); // party menu
 extern u8 pokemon_order_func(u8); // party menu
 extern bool8 InBattlePyramid(void);
@@ -3085,8 +3084,8 @@ static void BattleStartClearSetData(void)
 
     gBattleResults.shinyWildMon = IsMonShiny(&gEnemyParty[0]);
 
-    gBattleStruct->field_2A0 = 0;
-    gBattleStruct->field_2A1 = 0;
+    gBattleStruct->arenaLostPlayerMons = 0;
+    gBattleStruct->arenaLostOpponentMons = 0;
 }
 
 void SwitchInClearSetData(void)
@@ -3423,7 +3422,7 @@ static void BattleIntroDrawTrainersOrMonsSprites(void)
         }
 
         if (gBattleTypeFlags & BATTLE_TYPE_ARENA)
-            sub_81A56B4();
+            BattleArena_InitPoints();
     }
     gBattleMainFunc = BattleIntroDrawPartySummaryScreens;
 }
@@ -5479,7 +5478,7 @@ static void HandleAction_UseMove(void)
     }
 
     if (gBattleTypeFlags & BATTLE_TYPE_ARENA)
-        sub_81A56E8(gBattlerAttacker);
+        BattleArena_AddMindPoints(gBattlerAttacker);
 
     gCurrentActionFuncId = B_ACTION_EXEC_SCRIPT;
 }
diff --git a/src/battle_script_commands.c b/src/battle_script_commands.c
index b652049c4..0b5921942 100644
--- a/src/battle_script_commands.c
+++ b/src/battle_script_commands.c
@@ -43,6 +43,7 @@
 #include "battle_setup.h"
 #include "overworld.h"
 #include "party_menu.h"
+#include "battle_arena.h"
 
 extern u16 gBattle_BG1_X;
 extern u16 gBattle_BG1_Y;
@@ -54,17 +55,13 @@ extern struct MusicPlayerInfo gMPlayInfo_BGM;
 extern const u8* const gBattleScriptsForMoveEffects[];
 
 // functions
-extern void sub_81A5718(u8 battlerId); // battle frontier 2
-extern void sub_81A56B4(void); // battle frontier 2
 extern void ShowSelectMovePokemonSummaryScreen(struct Pokemon* party, u8 monPartyId, u8 monCount, void (*callback)(void), u16 move); // pokemon summary screen
 extern u8 sub_81C1B94(void); // pokemon summary screen
 extern void sub_81D388C(struct Pokemon* mon, void* statStoreLocation); // pokenav.s
 extern void sub_81D3640(u8 arg0, void* statStoreLocation1, void* statStoreLocation2, u8 arg3, u8 arg4, u8 arg5); // pokenav.s
 extern void sub_81D3784(u8 arg0, void* statStoreLocation1, u8 arg2, u8 arg3, u8 arg4); // pokenav.s
 extern u8* GetMonNickname(struct Pokemon* mon, u8* dst); // party_menu
-extern u8 sub_81A5258(u8* arg0); // battle frontier 2
-extern void sub_81A5BF8(void); // battle frontier 2
-extern void sub_81A5D44(void); // battle frontier 2
+extern u8 BattleArena_ShowJudgmentWindow(u8* arg0); // battle frontier 2
 extern void sub_81B8E80(u8 battlerId, u8, u8); // party menu
 extern bool8 sub_81B1250(void); // ?
 extern bool8 InBattlePike(void);
@@ -3549,7 +3546,7 @@ static void atk24(void)
         for (i = 0; i < 6; i++)
         {
             if (GetMonData(&gPlayerParty[i], MON_DATA_SPECIES) && !GetMonData(&gPlayerParty[i], MON_DATA_IS_EGG)
-             && (!(gBattleTypeFlags & BATTLE_TYPE_ARENA) || !(gBattleStruct->field_2A0 & gBitTable[i])))
+             && (!(gBattleTypeFlags & BATTLE_TYPE_ARENA) || !(gBattleStruct->arenaLostPlayerMons & gBitTable[i])))
             {
                 HP_count += GetMonData(&gPlayerParty[i], MON_DATA_HP);
             }
@@ -3562,7 +3559,7 @@ static void atk24(void)
     for (HP_count = 0, i = 0; i < 6; i++)
     {
         if (GetMonData(&gEnemyParty[i], MON_DATA_SPECIES) && !GetMonData(&gEnemyParty[i], MON_DATA_IS_EGG)
-            && (!(gBattleTypeFlags & BATTLE_TYPE_ARENA) || !(gBattleStruct->field_2A1 & gBitTable[i])))
+            && (!(gBattleTypeFlags & BATTLE_TYPE_ARENA) || !(gBattleStruct->arenaLostOpponentMons & gBitTable[i])))
         {
             HP_count += GetMonData(&gEnemyParty[i], MON_DATA_HP);
         }
@@ -4243,7 +4240,7 @@ static void atk3C_return(void)
 static void atk3D_end(void)
 {
     if (gBattleTypeFlags & BATTLE_TYPE_ARENA)
-        sub_81A5718(gBattlerAttacker);
+        BattleArena_AddSkillPoints(gBattlerAttacker);
 
     gMoveResultFlags = 0;
     gActiveBattler = 0;
@@ -5000,7 +4997,7 @@ static void atk4E_switchinanim(void)
     gBattlescriptCurrInstr += 3;
 
     if (gBattleTypeFlags & BATTLE_TYPE_ARENA)
-        sub_81A56B4();
+        BattleArena_InitPoints();
 }
 
 static void atk4F_jumpifcantswitch(void)
@@ -6697,34 +6694,34 @@ static void atk76_various(void)
             gBattleCommunication[MULTISTRING_CHOOSER] = sUnknown_0831C4F8[GetNatureFromPersonality(gBattleMons[gActiveBattler].personality)];
         }
         break;
-    case 9:
-        i = sub_81A5258(gBattleCommunication);
+    case VARIOUS_ARENA_JUDGMENT_WINDOW:
+        i = BattleArena_ShowJudgmentWindow(&gBattleCommunication[0]);
         if (i == 0)
             return;
 
         gBattleCommunication[1] = i;
         break;
-    case 10:
+    case VARIOUS_ARENA_OPPONENT_MON_LOST:
         gBattleMons[1].hp = 0;
         gHitMarker |= HITMARKER_FAINTED(1);
-        gBattleStruct->field_2A1 |= gBitTable[gBattlerPartyIndexes[1]];
+        gBattleStruct->arenaLostOpponentMons |= gBitTable[gBattlerPartyIndexes[1]];
         gDisableStructs[1].truantUnknownBit = 1;
         break;
-    case 11:
+    case VARIOUS_ARENA_PLAYER_MON_LOST:
         gBattleMons[0].hp = 0;
         gHitMarker |= HITMARKER_FAINTED(0);
         gHitMarker |= HITMARKER_x400000;
-        gBattleStruct->field_2A0 |= gBitTable[gBattlerPartyIndexes[0]];
+        gBattleStruct->arenaLostPlayerMons |= gBitTable[gBattlerPartyIndexes[0]];
         gDisableStructs[0].truantUnknownBit = 1;
         break;
-    case 12:
+    case VARIOUS_ARENA_BOTH_MONS_LOST:
         gBattleMons[0].hp = 0;
         gBattleMons[1].hp = 0;
         gHitMarker |= HITMARKER_FAINTED(0);
         gHitMarker |= HITMARKER_FAINTED(1);
         gHitMarker |= HITMARKER_x400000;
-        gBattleStruct->field_2A0 |= gBitTable[gBattlerPartyIndexes[0]];
-        gBattleStruct->field_2A1 |= gBitTable[gBattlerPartyIndexes[1]];
+        gBattleStruct->arenaLostPlayerMons |= gBitTable[gBattlerPartyIndexes[0]];
+        gBattleStruct->arenaLostOpponentMons |= gBitTable[gBattlerPartyIndexes[1]];
         gDisableStructs[0].truantUnknownBit = 1;
         gDisableStructs[1].truantUnknownBit = 1;
         break;
@@ -6738,11 +6735,11 @@ static void atk76_various(void)
     case 15:
         sub_81A5D44();
         break;
-    case 16:
+    case VARIOUS_ARENA_JUDGMENT_STRING:
         BattleStringExpandPlaceholdersToDisplayedString(gRefereeStringsTable[gBattlescriptCurrInstr[1]]);
         BattlePutTextOnWindow(gDisplayedStringBattle, 0x16);
         break;
-    case 17:
+    case VARIOUS_ARENA_WAIT_STRING:
         if (IsTextPrinterActive(0x16))
             return;
         break;
@@ -6775,8 +6772,8 @@ static void atk76_various(void)
     case VARIOUS_VOLUME_UP:
         m4aMPlayVolumeControl(&gMPlayInfo_BGM, 0xFFFF, 0x100);
         break;
-    case 23:
-        gBattleStruct->field_2A2 |= gBitTable[gActiveBattler];
+    case VARIOUS_SET_ALREADY_STATUS_MOVE_ATTEMPT:
+        gBattleStruct->alreadyStatusedMoveAttempt |= gBitTable[gActiveBattler];
         break;
     case 24:
         if (sub_805725C(gActiveBattler))
diff --git a/src/battle_util.c b/src/battle_util.c
index 1aaffc053..6fb5f4bdc 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -1200,8 +1200,8 @@ bool8 HandleWishPerishSongOnTurnEnd(void)
             for (i = 0; i < 2; i++)
                 CancelMultiTurnMoves(i);
 
-            gBattlescriptCurrInstr = BattleScript_82DB8F3;
-            BattleScriptExecute(BattleScript_82DB8F3);
+            gBattlescriptCurrInstr = BattleScript_ArenaDoJudgment;
+            BattleScriptExecute(BattleScript_ArenaDoJudgment);
             gBattleStruct->wishPerishSongState++;
             return TRUE;
         }