diff --git a/include/pokemon.h b/include/pokemon.h
index ec125573c1..dd957f9322 100644
--- a/include/pokemon.h
+++ b/include/pokemon.h
@@ -182,7 +182,6 @@ struct PokemonSubstruct3
  /* 0x05 */ u32 spAttackIV:5;
  /* 0x06 */ u32 spDefenseIV:5;
  /* 0x07 */ u32 isEgg:1;
- /* 0x07 */ u32 abilityNum:1;
 
  /* 0x08 */ u32 coolRibbon:3;
  /* 0x08 */ u32 beautyRibbon:3;
@@ -201,7 +200,8 @@ struct PokemonSubstruct3
  /* 0x0B */ u32 giftRibbon5:1;
  /* 0x0B */ u32 giftRibbon6:1;
  /* 0x0B */ u32 giftRibbon7:1;
- /* 0x0B */ u32 fatefulEncounter:4;
+ /* 0x0B */ u32 fatefulEncounter:2;
+ /* 0x0B */ u32 abilityNum:2;
  /* 0x0B */ u32 obedient:1;
 };
 
@@ -280,8 +280,7 @@ struct BattlePokemon
     /*0x15*/ u32 speedIV:5;
     /*0x16*/ u32 spAttackIV:5;
     /*0x17*/ u32 spDefenseIV:5;
-    /*0x17*/ u32 isEgg:1;
-    /*0x17*/ u32 abilityNum:1;
+    /*0x17*/ u32 abilityNum:2;
     /*0x18*/ s8 statStages[NUM_BATTLE_STATS];
     /*0x20*/ u8 ability;
     /*0x21*/ u8 type1;
diff --git a/src/battle_controller_link_opponent.c b/src/battle_controller_link_opponent.c
index d3842e416d..c6c733326b 100644
--- a/src/battle_controller_link_opponent.c
+++ b/src/battle_controller_link_opponent.c
@@ -601,7 +601,6 @@ static u32 CopyLinkOpponentMonData(u8 monId, u8 *dst)
         battleMon.speed = GetMonData(&gEnemyParty[monId], MON_DATA_SPEED);
         battleMon.spAttack = GetMonData(&gEnemyParty[monId], MON_DATA_SPATK);
         battleMon.spDefense = GetMonData(&gEnemyParty[monId], MON_DATA_SPDEF);
-        battleMon.isEgg = GetMonData(&gEnemyParty[monId], MON_DATA_IS_EGG);
         battleMon.abilityNum = GetMonData(&gEnemyParty[monId], MON_DATA_ABILITY_NUM);
         battleMon.otId = GetMonData(&gEnemyParty[monId], MON_DATA_OT_ID);
         GetMonData(&gEnemyParty[monId], MON_DATA_NICKNAME, nickname);
diff --git a/src/battle_controller_link_partner.c b/src/battle_controller_link_partner.c
index 1c92aaaad5..1ccb570e4a 100644
--- a/src/battle_controller_link_partner.c
+++ b/src/battle_controller_link_partner.c
@@ -486,7 +486,6 @@ static u32 CopyLinkPartnerMonData(u8 monId, u8 *dst)
         battleMon.speed = GetMonData(&gPlayerParty[monId], MON_DATA_SPEED);
         battleMon.spAttack = GetMonData(&gPlayerParty[monId], MON_DATA_SPATK);
         battleMon.spDefense = GetMonData(&gPlayerParty[monId], MON_DATA_SPDEF);
-        battleMon.isEgg = GetMonData(&gPlayerParty[monId], MON_DATA_IS_EGG);
         battleMon.abilityNum = GetMonData(&gPlayerParty[monId], MON_DATA_ABILITY_NUM);
         battleMon.otId = GetMonData(&gPlayerParty[monId], MON_DATA_OT_ID);
         GetMonData(&gPlayerParty[monId], MON_DATA_NICKNAME, nickname);
diff --git a/src/battle_controller_opponent.c b/src/battle_controller_opponent.c
index e096536c9e..d77a328280 100644
--- a/src/battle_controller_opponent.c
+++ b/src/battle_controller_opponent.c
@@ -584,7 +584,6 @@ static u32 GetOpponentMonData(u8 monId, u8 *dst)
         battleMon.speed = GetMonData(&gEnemyParty[monId], MON_DATA_SPEED);
         battleMon.spAttack = GetMonData(&gEnemyParty[monId], MON_DATA_SPATK);
         battleMon.spDefense = GetMonData(&gEnemyParty[monId], MON_DATA_SPDEF);
-        battleMon.isEgg = GetMonData(&gEnemyParty[monId], MON_DATA_IS_EGG);
         battleMon.abilityNum = GetMonData(&gEnemyParty[monId], MON_DATA_ABILITY_NUM);
         battleMon.otId = GetMonData(&gEnemyParty[monId], MON_DATA_OT_ID);
         GetMonData(&gEnemyParty[monId], MON_DATA_NICKNAME, nickname);
diff --git a/src/battle_controller_player.c b/src/battle_controller_player.c
index b73bfc36f4..fc7b0a76db 100644
--- a/src/battle_controller_player.c
+++ b/src/battle_controller_player.c
@@ -1627,7 +1627,6 @@ static u32 CopyPlayerMonData(u8 monId, u8 *dst)
         battleMon.speed = GetMonData(&gPlayerParty[monId], MON_DATA_SPEED);
         battleMon.spAttack = GetMonData(&gPlayerParty[monId], MON_DATA_SPATK);
         battleMon.spDefense = GetMonData(&gPlayerParty[monId], MON_DATA_SPDEF);
-        battleMon.isEgg = GetMonData(&gPlayerParty[monId], MON_DATA_IS_EGG);
         battleMon.abilityNum = GetMonData(&gPlayerParty[monId], MON_DATA_ABILITY_NUM);
         battleMon.otId = GetMonData(&gPlayerParty[monId], MON_DATA_OT_ID);
         GetMonData(&gPlayerParty[monId], MON_DATA_NICKNAME, nickname);
diff --git a/src/battle_controller_player_partner.c b/src/battle_controller_player_partner.c
index e625f24de9..c04e7b7fce 100644
--- a/src/battle_controller_player_partner.c
+++ b/src/battle_controller_player_partner.c
@@ -671,7 +671,6 @@ static u32 CopyPlayerPartnerMonData(u8 monId, u8 *dst)
         battleMon.speed = GetMonData(&gPlayerParty[monId], MON_DATA_SPEED);
         battleMon.spAttack = GetMonData(&gPlayerParty[monId], MON_DATA_SPATK);
         battleMon.spDefense = GetMonData(&gPlayerParty[monId], MON_DATA_SPDEF);
-        battleMon.isEgg = GetMonData(&gPlayerParty[monId], MON_DATA_IS_EGG);
         battleMon.abilityNum = GetMonData(&gPlayerParty[monId], MON_DATA_ABILITY_NUM);
         battleMon.otId = GetMonData(&gPlayerParty[monId], MON_DATA_OT_ID);
         GetMonData(&gPlayerParty[monId], MON_DATA_NICKNAME, nickname);
diff --git a/src/battle_controller_recorded_opponent.c b/src/battle_controller_recorded_opponent.c
index b21d8288ce..1f5fb46781 100644
--- a/src/battle_controller_recorded_opponent.c
+++ b/src/battle_controller_recorded_opponent.c
@@ -583,7 +583,6 @@ static u32 CopyRecordedOpponentMonData(u8 monId, u8 *dst)
         battleMon.speed = GetMonData(&gEnemyParty[monId], MON_DATA_SPEED);
         battleMon.spAttack = GetMonData(&gEnemyParty[monId], MON_DATA_SPATK);
         battleMon.spDefense = GetMonData(&gEnemyParty[monId], MON_DATA_SPDEF);
-        battleMon.isEgg = GetMonData(&gEnemyParty[monId], MON_DATA_IS_EGG);
         battleMon.abilityNum = GetMonData(&gEnemyParty[monId], MON_DATA_ABILITY_NUM);
         battleMon.otId = GetMonData(&gEnemyParty[monId], MON_DATA_OT_ID);
         GetMonData(&gEnemyParty[monId], MON_DATA_NICKNAME, nickname);
diff --git a/src/battle_controller_recorded_player.c b/src/battle_controller_recorded_player.c
index b59a4f25d7..1ef75d1ebb 100644
--- a/src/battle_controller_recorded_player.c
+++ b/src/battle_controller_recorded_player.c
@@ -566,7 +566,6 @@ static u32 CopyRecordedPlayerMonData(u8 monId, u8 *dst)
         battleMon.speed = GetMonData(&gPlayerParty[monId], MON_DATA_SPEED);
         battleMon.spAttack = GetMonData(&gPlayerParty[monId], MON_DATA_SPATK);
         battleMon.spDefense = GetMonData(&gPlayerParty[monId], MON_DATA_SPDEF);
-        battleMon.isEgg = GetMonData(&gPlayerParty[monId], MON_DATA_IS_EGG);
         battleMon.abilityNum = GetMonData(&gPlayerParty[monId], MON_DATA_ABILITY_NUM);
         battleMon.otId = GetMonData(&gPlayerParty[monId], MON_DATA_OT_ID);
         GetMonData(&gPlayerParty[monId], MON_DATA_NICKNAME, nickname);
diff --git a/src/battle_controller_wally.c b/src/battle_controller_wally.c
index f7035540b0..a90b81fbfd 100644
--- a/src/battle_controller_wally.c
+++ b/src/battle_controller_wally.c
@@ -484,7 +484,6 @@ static u32 CopyWallyMonData(u8 monId, u8 *dst)
         battleMon.speed = GetMonData(&gPlayerParty[monId], MON_DATA_SPEED);
         battleMon.spAttack = GetMonData(&gPlayerParty[monId], MON_DATA_SPATK);
         battleMon.spDefense = GetMonData(&gPlayerParty[monId], MON_DATA_SPDEF);
-        battleMon.isEgg = GetMonData(&gPlayerParty[monId], MON_DATA_IS_EGG);
         battleMon.abilityNum = GetMonData(&gPlayerParty[monId], MON_DATA_ABILITY_NUM);
         battleMon.otId = GetMonData(&gPlayerParty[monId], MON_DATA_OT_ID);
         GetMonData(&gPlayerParty[monId], MON_DATA_NICKNAME, nickname);
diff --git a/src/pokemon.c b/src/pokemon.c
index df31bc6b30..81418b775e 100644
--- a/src/pokemon.c
+++ b/src/pokemon.c
@@ -4580,7 +4580,6 @@ void CopyPlayerPartyMonToBattleData(u8 battlerId, u8 partyIndex)
     gBattleMons[battlerId].speed = GetMonData(&gPlayerParty[partyIndex], MON_DATA_SPEED, NULL);
     gBattleMons[battlerId].spAttack = GetMonData(&gPlayerParty[partyIndex], MON_DATA_SPATK, NULL);
     gBattleMons[battlerId].spDefense = GetMonData(&gPlayerParty[partyIndex], MON_DATA_SPDEF, NULL);
-    gBattleMons[battlerId].isEgg = GetMonData(&gPlayerParty[partyIndex], MON_DATA_IS_EGG, NULL);
     gBattleMons[battlerId].abilityNum = GetMonData(&gPlayerParty[partyIndex], MON_DATA_ABILITY_NUM, NULL);
     gBattleMons[battlerId].otId = GetMonData(&gPlayerParty[partyIndex], MON_DATA_OT_ID, NULL);
     gBattleMons[battlerId].type1 = gBaseStats[gBattleMons[battlerId].species].type1;