diff --git a/include/cable_club.h b/include/cable_club.h
index ebdc82b46d..60d56460d9 100644
--- a/include/cable_club.h
+++ b/include/cable_club.h
@@ -15,5 +15,6 @@ void sub_80B360C(void);
 bool32 sub_80B2AF4(u16 *arg0, u16 *arg1);
 void sub_80B3AF8(u8 taskId);
 void task00_08081A90(u8 taskId);
+bool32 sub_80B39D4(u8 linkPlayerIndex);
 
 #endif //GUARD_CABLE_CLUB_H
diff --git a/include/field_camera.h b/include/field_camera.h
index fdc4c54506..fecea244e4 100644
--- a/include/field_camera.h
+++ b/include/field_camera.h
@@ -32,5 +32,6 @@ void SetCameraPanningCallback(void (*a)(void));
 void SetCameraPanning(s16 a, s16 b);
 void InstallCameraPanAheadCallback(void);
 void UpdateCameraPanning(void);
+void FieldUpdateBgTilemapScroll(void);
 
 #endif //GUARD_FIELD_CAMERA_H
diff --git a/include/field_control_avatar.h b/include/field_control_avatar.h
index 3cc4a8324b..738cceb3e6 100644
--- a/include/field_control_avatar.h
+++ b/include/field_control_avatar.h
@@ -37,5 +37,7 @@ u8 sub_8068F18(void);
 bool8 dive_warp(struct MapPosition *position, u16 b);
 int SetCableClubWarp(void);
 u8 TrySetDiveWarp(void);
+const u8 *GetInteractedLinkPlayerScript(struct MapPosition *position, u8 metatileBehavior, u8 direction);
+u8 *GetCoordEventScriptAtMapPosition(struct MapPosition *position);
 
 #endif // GUARD_FIELDCONTROLAVATAR_H
diff --git a/include/field_effect.h b/include/field_effect.h
index 7620cedcd0..205dbb68a1 100644
--- a/include/field_effect.h
+++ b/include/field_effect.h
@@ -13,6 +13,7 @@ extern bool8 (*gFieldCallback2)(void);
 
 u32 FieldEffectStart(u8);
 bool8 FieldEffectActiveListContains(u8 id);
+void FieldEffectActiveListClear(void);
 void sub_80B69DC(void);
 u8 AddNewGameBirchObject(s16, s16, u8);
 void FieldEffectStop(struct Sprite *sprite, u8 id);
diff --git a/include/field_message_box.h b/include/field_message_box.h
index 9515a54fdd..58f782d9cf 100644
--- a/include/field_message_box.h
+++ b/include/field_message_box.h
@@ -17,5 +17,6 @@ void HideFieldMessageBox(void);
 bool8 IsFieldMessageBoxHidden(void);
 u8 GetFieldMessageBoxMode(void);
 void sub_8098374(void);
+void InitFieldMessageBox(void);
 
 #endif // GUARD_FIELD_MESSAGE_BOX_H
diff --git a/include/field_player_avatar.h b/include/field_player_avatar.h
index 3aedec5de7..45cd0dbd92 100644
--- a/include/field_player_avatar.h
+++ b/include/field_player_avatar.h
@@ -60,5 +60,8 @@ bool8 IsPlayerFacingSurfableFishableWater(void);
 bool8 IsPlayerSurfingNorth(void);
 void sub_808C228(u8 direction);
 u8 sub_808BCD0(void);
+void sub_808B578(void);
+u8 GetFRLGAvatarGraphicsIdByGender(u8);
+u8 GetRSAvatarGraphicsIdByGender(u8);
 
 #endif // GUARD_FIELD_PLAYER_AVATAR_H
diff --git a/include/field_screen_effect.h b/include/field_screen_effect.h
index 7f12bcd369..2b8b3a5a3a 100644
--- a/include/field_screen_effect.h
+++ b/include/field_screen_effect.h
@@ -40,5 +40,6 @@ void sub_80B0268(void);
 void sub_80B0534(void);
 void sub_80B058C(void);
 void sub_80B05B4(void);
+void WriteFlashScanlineEffectBuffer(u8 flashLevel);
 
 #endif // GUARD_FIELD_SCREEN_EFFECT_H
diff --git a/include/field_specials.h b/include/field_specials.h
index 10433299ba..981d65c0ab 100644
--- a/include/field_specials.h
+++ b/include/field_specials.h
@@ -23,5 +23,7 @@ bool8 sub_813B9C0(void);
 void SetShoalItemFlag(u16 v0);
 void UpdateFrontierManiac(u16 a0);
 void UpdateFrontierGambler(u16 a0);
+void ResetCyclingRoadChallengeData(void);
+bool8 warp0_in_pokecenter(void);
 
 #endif // GUARD_FIELD_SPECIALS_H
diff --git a/include/field_weather.h b/include/field_weather.h
index 91dcef1dc4..2d73f2b949 100644
--- a/include/field_weather.h
+++ b/include/field_weather.h
@@ -233,5 +233,6 @@ void SetSav1WeatherFromCurrMapHeader(void);
 void SetWeather(u32 weather);
 void DoCurrentWeather(void);
 void UpdateWeatherPerDay(u16 increment);
+void sub_80AEE84(void);
 
 #endif // GUARD_WEATHER_H
diff --git a/include/fieldmap.h b/include/fieldmap.h
index 3c7b7536de..24bc4989af 100644
--- a/include/fieldmap.h
+++ b/include/fieldmap.h
@@ -33,6 +33,12 @@ void InitMap(void);
 void InitMapFromSavedGame(void);
 void InitTrainerHillMap(void);
 void InitBattlePyramidMap(bool8 setPlayerPosition);
+void copy_map_tileset1_tileset2_to_vram(struct MapLayout const *mapLayout);
+void apply_map_tileset1_tileset2_palette(struct MapLayout const *mapLayout);
+void apply_map_tileset2_palette(struct MapLayout const *mapLayout);
+void copy_map_tileset2_to_vram_2(struct MapLayout const *mapLayout);
+extern void copy_map_tileset1_to_vram(const struct MapLayout *);
+extern void copy_map_tileset2_to_vram(const struct MapLayout *);
 
 void SpriteCB_PokeballGlow(struct Sprite *);
 void SpriteCB_PokecenterMonitor(struct Sprite *);
diff --git a/include/link.h b/include/link.h
index 9552f062cc..52a6315702 100644
--- a/include/link.h
+++ b/include/link.h
@@ -312,5 +312,7 @@ void sub_800AB18(void);
 void sub_8009F18(void);
 bool8 sub_800AA60(void);
 void sub_800ABF4(u16 a0);
+bool32 sub_8009F3C(void);
+u32 sub_800B4DC(void);
 
 #endif // GUARD_LINK_H
diff --git a/include/link_rfu.h b/include/link_rfu.h
index 08cab616cc..d468d6c498 100644
--- a/include/link_rfu.h
+++ b/include/link_rfu.h
@@ -282,5 +282,6 @@ void sub_800EF7C(void);
 bool8 sub_800DE7C(struct UnkLinkRfuStruct_02022B14 *buff1, u8 *buff2, u8 idx);
 s32 sub_800E87C(u8 idx);
 void sub_8011BA4(void);
+void sub_8010198(void);
 
 #endif //GUARD_LINK_RFU_H
diff --git a/include/match_call.h b/include/match_call.h
index 1f431bfaf1..17d40d41cf 100644
--- a/include/match_call.h
+++ b/include/match_call.h
@@ -11,5 +11,6 @@ enum {
 };
 
 s32 GetRematchIdxByTrainerIdx(s32 trainerIdx);
+void InitMatchCallCounters(void);
 
 #endif //GUARD_MATCH_CALL_H
diff --git a/include/secret_base.h b/include/secret_base.h
index 4b44d46786..57ad81fee3 100644
--- a/include/secret_base.h
+++ b/include/secret_base.h
@@ -22,6 +22,8 @@ void sub_80EB56C(void);
 void sub_80EB9E0(void);
 void sub_80EBB28(void);
 void WarpIntoSecretBase(const struct MapPosition *position, const struct MapEvents *events);
+bool8 sub_80E909C(void);
+void sub_80EB218(void);
 
 // SetCurrentSecretBaseFromPosition
 void sub_80E9608(const struct MapPosition *position, const struct MapEvents *events);
diff --git a/include/tileset_anims.h b/include/tileset_anims.h
new file mode 100755
index 0000000000..17d883cd2e
--- /dev/null
+++ b/include/tileset_anims.h
@@ -0,0 +1,9 @@
+#ifndef GUARD_TILESET_ANIMS_H
+#define GUARD_TILESET_ANIMS_H
+
+void cur_mapheader_run_tileset_funcs_after_some_cpuset(void);
+void sub_80A0A2C(void);
+void sub_80A0A38(void);
+void TransferTilesetAnimsBuffer(void);
+
+#endif // GUARD_TILESET_ANIMS_H
diff --git a/src/field_specials.c b/src/field_specials.c
index f2ebf2b8e2..3c26085dde 100644
--- a/src/field_specials.c
+++ b/src/field_specials.c
@@ -1956,7 +1956,7 @@ void sub_8139D98(void)
     }
 }
 
-bool32 warp0_in_pokecenter(void)
+bool8 warp0_in_pokecenter(void)
 {
     static const u16 gUnknown_085B2C2A[] = { 0x0202, 0x0301, 0x0405, 0x0504, 0x0604, 0x0700, 0x0804, 0x090b, 0x0a05, 0x0b05, 0x0c02, 0x0d06, 0x0e03, 0x0f02, 0x100c, 0x100a, 0x1a35, 0x193c, 0xFFFF };
 
diff --git a/src/new_game.c b/src/new_game.c
index 1581202458..f68ed3d4fb 100644
--- a/src/new_game.c
+++ b/src/new_game.c
@@ -8,6 +8,7 @@
 #include "lottery_corner.h"
 #include "play_time.h"
 #include "mauville_old_man.h"
+#include "match_call.h"
 #include "lilycove_lady.h"
 #include "load_save.h"
 #include "pokeblock.h"
@@ -47,7 +48,6 @@ extern void NewGameInitPCItems(void);
 extern void ClearDecorationInventories(void);
 extern void ResetFanClub(void);
 extern void copy_strings_to_sav1(void);
-extern void InitMatchCallCounters(void);
 extern void sub_801AFD8(void);
 extern void sub_800E5AC(void);
 extern void ResetContestLinkResults(void);
diff --git a/src/overworld.c b/src/overworld.c
index 2bc4f96d56..43610fe094 100644
--- a/src/overworld.c
+++ b/src/overworld.c
@@ -19,6 +19,7 @@
 #include "field_tasks.h"
 #include "field_weather.h"
 #include "fieldmap.h"
+#include "fldeff.h"
 #include "gpu_regs.h"
 #include "heal_location.h"
 #include "link.h"
@@ -28,6 +29,7 @@
 #include "alloc.h"
 #include "m4a.h"
 #include "map_name_popup.h"
+#include "match_call.h"
 #include "menu.h"
 #include "metatile_behavior.h"
 #include "mirage_tower.h"
@@ -42,14 +44,15 @@
 #include "save.h"
 #include "save_location.h"
 #include "script.h"
-// #include "script_pokemon_80C4.h"
+#include "script_pokemon_util_80F87D8.h"
 #include "secret_base.h"
 #include "sound.h"
 #include "start_menu.h"
 #include "task.h"
-// #include "tileset_anim.h"
+#include "tileset_anims.h"
 #include "time_events.h"
 #include "trainer_hill.h"
+#include "trainer_pokemon_sprites.h"
 #include "tv.h"
 #include "scanline_effect.h"
 #include "wild_encounter.h"
@@ -85,71 +88,11 @@ extern const u8 gUnknown_082773F5[];
 extern const u8 gUnknown_082774EF[];
 extern const u8 gUnknown_08277509[];
 
-// vars
 extern const struct MapLayout *const gMapLayouts[];
 extern const struct MapHeader *const *const gMapGroups[];
-extern const s32 gMaxFlashLevel;
+extern const int gMaxFlashLevel;
 extern const u16 gUnknown_82EC7C4[];
 
-// functions
-extern void HealPlayerParty(void);
-extern void move_tilemap_camera_to_upper_left_corner(void);
-extern void cur_mapheader_run_tileset_funcs_after_some_cpuset(void);
-extern void DrawWholeMapView(void);
-extern void copy_map_tileset1_tileset2_to_vram(const struct MapLayout *);
-extern void apply_map_tileset1_tileset2_palette(const struct MapLayout *);
-extern void ResetCyclingRoadChallengeData(void);
-extern void ApplyNewEncryptionKeyToWord(u32 *word, u32 newKey);
-extern void mapheader_run_script_with_tag_x5(void);
-extern void ResetFieldTasksArgs(void);
-extern void sub_80A0A2C(void);
-extern void apply_map_tileset2_palette(const struct MapLayout *);
-extern void copy_map_tileset2_to_vram_2(const struct MapLayout *);
-extern void RestartWildEncounterImmunitySteps(void);
-extern void ShowMapNamePopup(void);
-extern bool32 sub_808651C(void);
-extern bool8 sub_80AF6A4(void);
-extern bool8 sub_80E909C(void);
-extern void c2_change_map(void);
-extern void sub_81D5DF8(void);
-extern void sub_80EB218(void);
-extern void sub_80AF3C8(void);
-extern void sub_808B578(void);
-extern void sub_80AF314(void);
-extern void sub_80AF214(void);
-extern void sub_80AF188(void);
-extern void RotatingGate_InitPuzzleAndGraphics(void);
-extern void sub_80AF168(void);
-extern void sub_80AF3C8(void);
-extern void ExecuteTruckSequence(void);
-extern void sub_80A0A38(void);
-extern void WriteFlashScanlineEffectBuffer(u8);
-extern void InitMatchCallCounters(void);
-extern void sub_80EDB44(void);
-extern void InitFieldMessageBox(void);
-extern void copy_map_tileset1_to_vram(const struct MapLayout *);
-extern void copy_map_tileset2_to_vram(const struct MapLayout *);
-extern void FieldUpdateBgTilemapScroll(void);
-extern void TransferTilesetAnimsBuffer(void);
-extern bool8 warp0_in_pokecenter(void);
-extern void ResetAllPicSprites(void);
-extern void FieldEffectActiveListClear(void);
-extern void SetUpFieldTasks(void);
-extern void ShowStartMenu(void);
-extern void sub_80AEE84(void);
-extern void mapldr_default(void);
-extern bool32 sub_800F0B8(void);
-extern bool32 sub_8009F3C(void);
-extern void sub_8010198(void);
-extern u32 sub_800B4DC(void);
-extern bool32 sub_80B39D4(u8);
-extern const u8* GetInteractedLinkPlayerScript(struct MapPosition *a1, u8, u8);
-extern u8 *GetCoordEventScriptAtMapPosition(void*);
-extern u8 GetFRLGAvatarGraphicsIdByGender(u8);
-extern u8 GetRSAvatarGraphicsIdByGender(u8);
-extern void UpdateEventObjectSpriteVisibility(struct Sprite*, u8);
-
-// this file's functions
 static void Overworld_ResetStateAfterWhiteOut(void);
 static void c2_80567AC(void);
 static void CB2_LoadMap2(void);