Add documentation for AddUniqueStarterMoveTo

CREDITS.txt

@@ -38,6 +38,7 @@ other parts of the project, feel free to add yourself to this file!
 - Chesyon
 - Xaklor
 - Caitemis
+- Itred12
 - The rest of the contributors to Project Pokémon's technical documentation
   for the NDS Mystery Dungeon games, which can be found here:
   https://projectpokemon.org/home/docs/mystery-dungeon-nds/

headers/functions/arm9.h

@@ -1214,6 +1214,7 @@ void SetBaseStatsMovesGroundMonster(struct ground_monster* ground_monster);
 bool StrcmpMonsterName(char* string, enum monster_id monster_id);
 void InitializeTeamMemberFromMentry(struct team_member* team_member,
                                     struct ground_monster* ground_monster, int32_t slot_index);
+void AddUniqueStarterMoveTo(struct ground_monster* ground_monster);
 void GetLvlUpEntry(struct level_up_entry* level_up_entry, enum monster_id monster_id, int level);
 uint8_t* GetEncodedHalfword(uint8_t* data_ptr, uint16_t* result);
 int GetEvoFamily(undefined* monster, undefined* evo_family);

symbols/arm9.yml

@@ -11556,6 +11556,25 @@ arm9:
         r0: team_member pointer
         r1: ground_monster pointer
         r2: team_member index
+    - name: AddUniqueStarterMoveTo
+      address:
+        NA: 0x2053568
+      description: |-
+        Grants certain starter Pokemon a unique move that they cannot normally learn.
+
+        Only called during InitMainTeamAfterQuiz, for both the hero and the partner.
+        Will skip granting any move if the target somehow already has four moves.
+        Gives the following:
+        - Vulpix: Faint Attack
+        - Eevee: Flail
+        - Phanphy: Ancient Power
+        - Shinx: Quick Attack
+        - Riolu: Bite
+        - Meowth: Hypnosis
+        - Munchlax: Zen Headbutt
+        - Skitty: Zen Headbutt
+
+        r0: pointer to the ground_monster to attempt to grant a move to, as either the hero or the partner.
     - name: GetLvlUpEntry
       address:
         EU: 0x2053B18