3 files changed, 90 insertions, 0 deletions
diff --git a/include/constants/flags.h b/include/constants/flags.h
index e74ef1ef0..04c20b2f2 100644
--- a/include/constants/flags.h
+++ b/include/constants/flags.h
@@ -1286,6 +1286,13 @@
 #define TRAINERS_FLAG_NO    0x356
 #define CODE_FLAGS          (FLAG_TRAINER_FLAG_START + TRAINERS_FLAG_NO + 0xA) // 0x860
 
+// TODO: Find what these are
+#define FLAG_UNK820         0x820
+#define FLAG_UNK824         0x824
+#define FLAG_UNK826         0x826
+
+#define FLAG_UNK843         0x843
+
 // SYSTEM FLAGS
 
 // 0x860
diff --git a/include/constants/items.h b/include/constants/items.h
index 6135b8d6f..dd2b4c4ed 100644
--- a/include/constants/items.h
+++ b/include/constants/items.h
@@ -390,4 +390,7 @@
 #define NUM_TECHNICAL_MACHINES 50
 #define NUM_HIDDEN_MACHINES     8
 
+// Check if the item is one that can be used on a Pokemon.
+#define IS_POKEMON_ITEM(item) ((item) >= ITEM_POTION && (item) <= ITEM_0B2)
+
 #endif  // GUARD_CONSTANTS_ITEMS_H
diff --git a/include/constants/pokemon.h b/include/constants/pokemon.h
new file mode 100644
index 000000000..78c1583b4
--- /dev/null
+++ b/include/constants/pokemon.h
@@ -0,0 +1,80 @@
+#ifndef GUARD_CONSTANTS_POKEMON_H
+#define GUARD_CONSTANTS_POKEMON_H
+
+// Pokemon types
+#define TYPE_NORMAL   0x00
+#define TYPE_FIGHTING 0x01
+#define TYPE_FLYING   0x02
+#define TYPE_POISON   0x03
+#define TYPE_GROUND   0x04
+#define TYPE_ROCK     0x05
+#define TYPE_BUG      0x06
+#define TYPE_GHOST    0x07
+#define TYPE_STEEL    0x08
+#define TYPE_MYSTERY  0x09
+#define TYPE_FIRE     0x0a
+#define TYPE_WATER    0x0b
+#define TYPE_GRASS    0x0c
+#define TYPE_ELECTRIC 0x0d
+#define TYPE_PSYCHIC  0x0e
+#define TYPE_ICE      0x0f
+#define TYPE_DRAGON   0x10
+#define TYPE_DARK     0x11
+#define NUMBER_OF_MON_TYPES     0x12
+
+// Pokemon egg groups
+#define EGG_GROUP_NONE 0
+#define EGG_GROUP_MONSTER 1
+#define EGG_GROUP_WATER_1 2
+#define EGG_GROUP_BUG 3
+#define EGG_GROUP_FLYING 4
+#define EGG_GROUP_FIELD 5
+#define EGG_GROUP_FAIRY 6
+#define EGG_GROUP_GRASS 7
+#define EGG_GROUP_HUMAN_LIKE 8
+#define EGG_GROUP_WATER_3 9
+#define EGG_GROUP_MINERAL 10
+#define EGG_GROUP_AMORPHOUS 11
+#define EGG_GROUP_WATER_2 12
+#define EGG_GROUP_DITTO 13
+#define EGG_GROUP_DRAGON 14
+#define EGG_GROUP_UNDISCOVERED 15
+
+// Pokemon natures
+#define NATURE_HARDY 0
+#define NATURE_LONELY 1
+#define NATURE_BRAVE 2
+#define NATURE_ADAMANT 3
+#define NATURE_NAUGHTY 4
+#define NATURE_BOLD 5
+#define NATURE_DOCILE 6
+#define NATURE_RELAXED 7
+#define NATURE_IMPISH 8
+#define NATURE_LAX 9
+#define NATURE_TIMID 10
+#define NATURE_HASTY 11
+#define NATURE_SERIOUS 12
+#define NATURE_JOLLY 13
+#define NATURE_NAIVE 14
+#define NATURE_MODEST 15
+#define NATURE_MILD 16
+#define NATURE_QUIET 17
+#define NATURE_BASHFUL 18
+#define NATURE_RASH 19
+#define NATURE_CALM 20
+#define NATURE_GENTLE 21
+#define NATURE_SASSY 22
+#define NATURE_CAREFUL 23
+#define NATURE_QUIRKY 24
+
+// Pokemon Stats
+#define STAT_HP 0
+#define STAT_ATK 1
+#define STAT_DEF 2
+#define STAT_SPEED 3
+#define STAT_SPATK 4
+#define STAT_SPDEF 5
+#define STAT_ACC 6 // only in battles
+#define STAT_EVASION 7 // only in battles
+
+#endif // GUARD_CONSTANTS_POKEMON_H