4 files changed, 42 insertions, 10 deletions
diff --git a/include/constants/layouts.h b/include/constants/layouts.h
index 24cdcec13..a9d40220f 100644
--- a/include/constants/layouts.h
+++ b/include/constants/layouts.h
@@ -36,10 +36,10 @@
 #define LAYOUT_CINNABAR_ISLAND_GYM 36
 #define LAYOUT_VIRIDIAN_CITY_GYM 37
 #define LAYOUT_UNUSED_LAYOUT_82D88C8 46
-#define LAYOUT_UNKNOWN_MAP_00_00 47
-#define LAYOUT_UNKNOWN_MAP_00_01 48
-#define LAYOUT_UNKNOWN_MAP_00_02 49
-#define LAYOUT_UNKNOWN_MAP_00_03 50
+#define LAYOUT_BATTLE_COLOSSEUM_2P 47
+#define LAYOUT_TRADE_CENTER 48
+#define LAYOUT_RECORD_CENTER 49
+#define LAYOUT_BATTLE_COLOSSEUM_4P 50
 #define LAYOUT_FUCHSIA_CITY_SAFARI_ZONE_ENTRANCE 51
 #define LAYOUT_UNUSED_LAYOUT_82D9B24 52
 #define LAYOUT_UNUSED_LAYOUT_82DA7C8 53
@@ -244,7 +244,7 @@
 #define LAYOUT_UNUSED_LAYOUT_83377F0 259
 #define LAYOUT_UNUSED_LAYOUT_8338354 260
 #define LAYOUT_UNUSED_LAYOUT_8338738 261
-#define LAYOUT_UNKNOWN_MAP_00_04 262
+#define LAYOUT_UNION_ROOM 262
 #define LAYOUT_SAFFRON_CITY_POKEMON_TRAINER_FAN_CLUB 263
 #define LAYOUT_UNUSED_LAYOUT_8338B4C 264
 #define LAYOUT_SEVEN_ISLAND_HOUSE_ROOM2 265
diff --git a/include/constants/map_groups.h b/include/constants/map_groups.h
index 13862d6c7..4d37b0dc8 100644
--- a/include/constants/map_groups.h
+++ b/include/constants/map_groups.h
@@ -2,11 +2,11 @@
 #define GUARD_CONSTANTS_MAP_GROUPS_H
 
 // Map Group 0
-#define MAP_UNKNOWN_MAP_00_00 (0 | (0 << 8))
-#define MAP_UNKNOWN_MAP_00_01 (1 | (0 << 8))
-#define MAP_UNKNOWN_MAP_00_02 (2 | (0 << 8))
-#define MAP_UNKNOWN_MAP_00_03 (3 | (0 << 8))
-#define MAP_UNKNOWN_MAP_00_04 (4 | (0 << 8))
+#define MAP_BATTLE_COLOSSEUM_2P (0 | (0 << 8))
+#define MAP_TRADE_CENTER        (1 | (0 << 8))
+#define MAP_RECORD_CENTER       (2 | (0 << 8))
+#define MAP_BATTLE_COLOSSEUM_4P (3 | (0 << 8))
+#define MAP_UNION_ROOM          (4 | (0 << 8))
 
 // Map Group 1
 #define MAP_VIRIDIAN_FOREST                      (0 | (1 << 8))
diff --git a/include/constants/pokemon.h b/include/constants/pokemon.h
index a2ad90776..c6fc55003 100644
--- a/include/constants/pokemon.h
+++ b/include/constants/pokemon.h
@@ -87,4 +87,8 @@
 #define MON_ALREADY_KNOWS_MOVE 0xFFFE
 #define MON_HAS_MAX_MOVES      0xFFFF
 
+#define PLAYER_HAS_TWO_USABLE_MONS              0x0
+#define PLAYER_HAS_ONE_MON                      0x1
+#define PLAYER_HAS_ONE_USABLE_MON               0x2
+
 #endif // GUARD_CONSTANTS_POKEMON_H
diff --git a/include/constants/union_room.h b/include/constants/union_room.h
new file mode 100644
index 000000000..2314f85a0
--- /dev/null
+++ b/include/constants/union_room.h
@@ -0,0 +1,28 @@
+#ifndef GUARD_CONSTANTS_UNION_ROOM_H
+#define GUARD_CONSTANTS_UNION_ROOM_H
+
+#define LINK_GROUP_SINGLE_BATTLE        0
+#define LINK_GROUP_DOUBLE_BATTLE        1
+#define LINK_GROUP_MULTI_BATTLE         2
+#define LINK_GROUP_TRADE                3
+#define LINK_GROUP_POKEMON_JUMP         4
+#define LINK_GROUP_BERRY_CRUSH          5
+#define LINK_GROUP_BERRY_PICKING        6
+#define LINK_GROUP_WONDER_CARD          7
+#define LINK_GROUP_WONDER_NEWS          8
+#define LINK_GROUP_UNK_9                9
+#define LINK_GROUP_UNK_10               10
+#define LINK_GROUP_UNK_11               11
+#define LINK_GROUP_RECORD_CORNER        12
+#define LINK_GROUP_BERRY_BLENDER        13
+#define LINK_GROUP_UNK_14               14
+#define LINK_GROUP_COOL_CONTEST         15
+#define LINK_GROUP_BEAUTY_CONTEST       16
+#define LINK_GROUP_CUTE_CONTEST         17
+#define LINK_GROUP_SMART_CONTEST        18
+#define LINK_GROUP_TOUGH_CONTEST        19
+#define LINK_GROUP_BATTLE_TOWER         20
+#define LINK_GROUP_BATTLE_TOWER_OPEN    21
+#define NUM_LINK_GROUP_TYPES            22
+
+#endif //GUARD_CONSTANTS_UNION_ROOM_H