diff --git a/headers/data/ram.h b/headers/data/ram.h
index 371116b2..3b06a553 100644
--- a/headers/data/ram.h
+++ b/headers/data/ram.h
@@ -64,10 +64,10 @@ extern struct mem_arena* GROUND_MEMORY_ARENA_1_PTR;
 extern struct mem_arena* GROUND_MEMORY_ARENA_2_PTR;
 extern bool LOCK_NOTIFY_ARRAY[20];
 extern struct mem_arena GROUND_MEMORY_ARENA_1;
-extern struct dungeon_button_input DUNGEON_BUTTON_INPUT;
 extern struct mem_block GROUND_MEMORY_ARENA_1_BLOCKS[52];
 extern uint8_t GROUND_MEMORY_ARENA_1_MEMORY[408324];
 extern struct sentry_duty SENTRY_DUTY_STRUCT;
+extern struct dungeon_button_input DUNGEON_BUTTON_INPUT;
 extern bool TURNING_ON_THE_SPOT_FLAG;
 extern struct loaded_attack_sprite_data* LOADED_ATTACK_SPRITE_DATA;
 extern enum mobility_type MOBILITY_TYPE_TO_DUNGEON_MOBILITY_TYPE[8];
diff --git a/headers/functions/arm9.h b/headers/functions/arm9.h
index 65df6295..2619bca7 100644
--- a/headers/functions/arm9.h
+++ b/headers/functions/arm9.h
@@ -1010,6 +1010,7 @@ bool IsSpecialEpisodeDungeon(enum dungeon_id dungeon_id);
 enum item_id RetrieveFromItemList1(undefined* dungeon_info, undefined4 param_2);
 bool IsForbiddenFloor(undefined* dungeon_info, undefined4 param_2, undefined4 param_3,
                       undefined4 param_4);
+void Copy16BitsTo(undefined* write_info, void* buf_write);
 void Copy16BitsFrom(undefined* read_info, void* buf_read);
 enum item_id RetrieveFromItemList2(undefined* dungeon_info, undefined4 param_2);
 bool IsInvalidForMission(enum dungeon_id dungeon_id);
@@ -1146,6 +1147,7 @@ void EnableAllLearnableIqSkills(uint32_t* iq_skills_flags, enum monster_id monst
                                 int monster_iq);
 bool IqSkillFlagTest(uint32_t* iq_skill_flags, enum iq_skill_id iq_id);
 enum iq_skill_id GetNextIqSkill(enum monster_id monster_id, int monster_iq);
+bool ExplorerMazeMonsterExists(void);
 void GetExplorerMazeTeamName(char* buffer);
 struct ground_monster* GetExplorerMazeMonster(uint8_t entry_number);
 undefined4 WriteMonsterInfoToSave(void* start_addr, uint32_t total_len);
@@ -1154,6 +1156,7 @@ void WriteMonsterToSave(undefined* write_info, struct ground_monster* monster);
 void ReadMonsterFromSave(undefined* read_info, struct ground_monster* monster);
 void GetEvolutionPossibilities(struct ground_monster* monster, undefined* evo);
 int GetMonsterEvoStatus(struct ground_monster* monster);
+bool HandleShedinjaEvolution(int16_t* member_idx, enum monster_id monster_id);
 void CopyTacticString(char* buffer, enum tactic_id tactic_id);
 void GetStatBoostsForMonsterSummary(struct monster_summary* monster_summary,
                                     enum monster_id monster_id, struct item* item, int iq,
diff --git a/symbols/arm9.yml b/symbols/arm9.yml
index da1ff5c3..c51279c7 100644
--- a/symbols/arm9.yml
+++ b/symbols/arm9.yml
@@ -9581,6 +9581,16 @@ arm9:
         r0: dungeon_info
         others: ?
         return: bool
+    - name: Copy16BitsTo
+      address:
+        EU: 0x20518FC
+        NA: 0x20515C4
+        JP: 0x2051914
+      description: |-
+        Writes 16 bits of data from buffer_write to write_info.
+        
+        r0: write_info
+        r1: buffer_write
     - name: Copy16BitsFrom
       address:
         EU: 0x2051924
@@ -10974,6 +10984,15 @@ arm9:
         r0: Monster ID
         r1: Monster IQ
         return: ID of the next skill learned by the monster, or IQ_NONE if the monster won't learn any more skills.
+    - name: ExplorerMazeMonsterExists
+      address:
+        EU: 0x2059320
+        NA: 0x2058FA4
+        JP: 0x20592A0
+      description: |-
+        Returns true if there is Explorer Maze monster data in TEAM_MEMBER_TABLE_PTR->explorer_maze_monsters.
+        
+        return: True if there is Explorer Maze monster data in TEAM_MEMBER_TABLE_PTR->explorer_maze_monsters, false otherwise.
     - name: GetExplorerMazeTeamName
       address:
         EU: 0x20593DC
@@ -11059,6 +11078,17 @@ arm9:
         
         r0: ground_monster
         return: evo_status
+    - name: HandleShedinjaEvolution
+      address:
+        EU: 0x205A604
+        NA: 0x205A288
+        JP: 0x205A584
+      description: |-
+        Checks to see if the player just evolved a Nincada into Ninjask. If so, adds a Shedinja to the player's team.
+        
+        r0: pointer to current team member index
+        r1: monster_id
+        return: true
     - name: CopyTacticString
       address:
         EU: 0x205A7AC
diff --git a/symbols/overlay26.yml b/symbols/overlay26.yml
index 87d1530a..31028ac2 100644
--- a/symbols/overlay26.yml
+++ b/symbols/overlay26.yml
@@ -18,6 +18,7 @@ overlay26:
       address:
         EU: 0x238B960
         NA: 0x238AE20
+        JP: 0x238C380
       length:
         NA: 0x8C
       description: |-
@@ -40,6 +41,7 @@ overlay26:
       address:
         EU: 0x238BAA0
         NA: 0x238AF60
+        JP: 0x238C4C0
       length:
         NA: 0x4
       description: "Note: unverified, ported from Irdkwia's notes"
@@ -47,6 +49,7 @@ overlay26:
       address:
         EU: 0x238BAA4
         NA: 0x238AF64
+        JP: 0x238C4C4
       length:
         NA: 0x4
       description: "Note: unverified, ported from Irdkwia's notes"
@@ -54,6 +57,7 @@ overlay26:
       address:
         EU: 0x238BAA8
         NA: 0x238AF68
+        JP: 0x238C4C8
       length:
         NA: 0x4
       description: "Note: unverified, ported from Irdkwia's notes"
@@ -61,6 +65,7 @@ overlay26:
       address:
         EU: 0x238BAAC
         NA: 0x238AF6C
+        JP: 0x238C4CC
       length:
         NA: 0x4
       description: "Note: unverified, ported from Irdkwia's notes"
@@ -68,6 +73,7 @@ overlay26:
       address:
         EU: 0x238BAB0
         NA: 0x238AF70
+        JP: 0x238C4D0
       length:
         NA: 0x4
       description: "Note: unverified, ported from Irdkwia's notes"
diff --git a/symbols/overlay29.yml b/symbols/overlay29.yml
index 7ead0416..f7dc3b21 100644
--- a/symbols/overlay29.yml
+++ b/symbols/overlay29.yml
@@ -361,6 +361,8 @@ overlay29:
     - name: GetAndStoreButtonInput
       address:
         EU: 0x22E13A4
+        NA: 0x22E0A64
+        JP: 0x22E20F4
       description: |-
         Gets and stores the button input for the current frame in DUNGEON_BUTTON_INPUT.
         
@@ -7357,6 +7359,8 @@ overlay29:
     - name: GetPaletteBaseAddress
       address:
         EU: 0x23362B0
+        NA: 0x2335864
+        JP: 0x2336C34
       description: |-
         Gets the palette base address for a 3D element loaded from a WTE file.
         Takes the same parameters as were used in the specified file's ProcessWte call.
diff --git a/symbols/ram.yml b/symbols/ram.yml
index 460703ca..97018de7 100644
--- a/symbols/ram.yml
+++ b/symbols/ram.yml
@@ -642,15 +642,6 @@ ram:
         Including the allocator metadata, this arena occupies 0x64000 bytes of space.
         
         type: struct mem_arena
-    - name: DUNGEON_BUTTON_INPUT
-      address:
-        EU: 0x237D294
-      length:
-        EU: 0xE
-      description: |-
-        [Runtime] Stores information about the user's current button input in dungeon mode.
-        
-        type: struct dungeon_button_input
     - name: GROUND_MEMORY_ARENA_1_BLOCKS
       address:
         NA: 0x2324FDC
@@ -671,6 +662,19 @@ ram:
         NA: 0x237A5D0
       length:
         NA: 0x38D4
+    - name: DUNGEON_BUTTON_INPUT
+      address:
+        EU: 0x237D294
+        NA: 0x237C694
+        JP: 0x237D914
+      length:
+        EU: 0xE
+        NA: 0xE
+        JP: 0xE
+      description: |-
+        [Runtime] Stores information about the user's current button input in dungeon mode.
+        
+        type: struct dungeon_button_input
     - name: TURNING_ON_THE_SPOT_FLAG
       address:
         EU: 0x237D5A6