diff --git a/include/battle.h b/include/battle.h
index 36ffdb6da0..82993b73e2 100644
--- a/include/battle.h
+++ b/include/battle.h
@@ -456,6 +456,7 @@ struct MegaEvolutionData
     bool8 playerSelect;
     u8 triggerSpriteId;
     bool8 isWishMegaEvo;
+    bool32 didMegaEvo[PARTY_SIZE][2]; // For each party member and side.
 };
 
 struct Illusion
diff --git a/include/battle_util.h b/include/battle_util.h
index 5dbefd7e7e..9b8109c398 100644
--- a/include/battle_util.h
+++ b/include/battle_util.h
@@ -201,6 +201,6 @@ bool32 CanBeParalyzed(u8 battlerId);
 bool32 CanBeFrozen(u8 battlerId);
 bool32 CanBeConfused(u8 battlerId);
 bool32 IsBattlerTerrainAffected(u8 battlerId, u32 terrainFlag);
-u32 GetMonFriendshipScore(struct Pokemon *pokemon);
+u32 GetBattlerFriendshipScore(u8 battlerId);
 
 #endif // GUARD_BATTLE_UTIL_H
diff --git a/include/pokemon.h b/include/pokemon.h
index c05628a598..7a38508274 100644
--- a/include/pokemon.h
+++ b/include/pokemon.h
@@ -559,5 +559,6 @@ u16 GetFormChangeTargetSpecies(struct Pokemon *mon, u16 method, u32 arg);
 u16 GetFormChangeTargetSpeciesBoxMon(struct BoxPokemon *mon, u16 method, u32 arg);
 u16 MonTryLearningNewMoveEvolution(struct Pokemon *mon, bool8 firstMove);
 bool32 ShouldShowFemaleDifferences(u16 species, u32 personality);
+u32 GetMonFriendshipScore(struct Pokemon *pokemon);
 
 #endif // GUARD_POKEMON_H
diff --git a/src/battle_script_commands.c b/src/battle_script_commands.c
index a5a822546c..361abe2419 100644
--- a/src/battle_script_commands.c
+++ b/src/battle_script_commands.c
@@ -1734,7 +1734,7 @@ u32 GetTotalAccuracy(u32 battlerAtk, u32 battlerDef, u32 move, u32 atkAbility, u
 #if B_AFFECTION_MECHANICS == TRUE
     // With high affection/friendship there's a chance to evade a move by substracting 10% of its accuracy.
     // I can't find exact information about that chance, so I'm just gonna write it as a 20% chance for now.
-    if (GetMonFriendshipScore(&gPlayerParty[gBattlerPartyIndexes[battlerDef]]) >= FRIENDSHIP_150_TO_199 && (Random() % 100) <= 20)
+    if (GetMonFriendshipScore(battlerDef) >= FRIENDSHIP_150_TO_199 && (Random() % 100) <= 20)
         calc = (calc * 90) / 100;
 #endif
 
@@ -1907,7 +1907,7 @@ s32 CalcCritChanceStage(u8 battlerAtk, u8 battlerDef, u32 move, bool32 recordAbi
                     + 2 * (holdEffectAtk == HOLD_EFFECT_LUCKY_PUNCH && gBattleMons[gBattlerAttacker].species == SPECIES_CHANSEY)
                     + 2 * BENEFITS_FROM_LEEK(battlerAtk, holdEffectAtk)
                 #if B_AFFECTION_MECHANICS == TRUE
-                    + 2 * (GetMonFriendshipScore(&gPlayerParty[gBattlerPartyIndexes[gBattlerAttacker]]) >= FRIENDSHIP_200_TO_254)
+                    + 2 * (GetMonFriendshipScore(gBattlerAttacker) >= FRIENDSHIP_200_TO_254)
                 #endif
                     + (abilityAtk == ABILITY_SUPER_LUCK);
 
@@ -1977,7 +1977,7 @@ static void Cmd_adjustdamage(void)
 {
     u8 holdEffect, param;
     u32 moveType;
-    u32 friendshipScore = GetMonFriendshipScore(&gPlayerParty[gBattlerPartyIndexes[gBattlerTarget]]);
+    u32 friendshipScore = GetBattlerFriendshipScore(gBattlerTarget);
     u32 rand = Random() % 100;
 
     GET_MOVE_TYPE(gCurrentMove, moveType);
@@ -4063,7 +4063,7 @@ static void Cmd_getexp(void)
                     }
                     #endif
                 #if B_AFFECTION_MECHANICS == TRUE
-                    if (GetMonFriendshipScore(&gPlayerParty[gBattleStruct->expGetterMonId]) >= FRIENDSHIP_50_TO_99)
+                    if (GetMonFriendshipScore(gBattleStruct->expGetterMonId) >= FRIENDSHIP_50_TO_99)
                         gBattleMoveDamage = (gBattleMoveDamage * 120) / 100;
                 #endif
 
@@ -8652,6 +8652,7 @@ static void Cmd_various(void)
 
             gBattleMons[gActiveBattler].species = megaSpecies;
             PREPARE_SPECIES_BUFFER(gBattleTextBuff1, gBattleMons[gActiveBattler].species);
+            gBattleStruct->mega.didMegaEvo[gActiveBattler][GetBattlerSide(gActiveBattler)] = TRUE;
 
             BtlController_EmitSetMonData(BUFFER_A, REQUEST_SPECIES_BATTLE, gBitTable[gBattlerPartyIndexes[gActiveBattler]], sizeof(gBattleMons[gActiveBattler].species), &gBattleMons[gActiveBattler].species);
             MarkBattlerForControllerExec(gActiveBattler);
diff --git a/src/battle_util.c b/src/battle_util.c
index f38d80a69c..5cb2badb0e 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -2104,24 +2104,23 @@ void TryToRevertMimicry(void)
     }
 }
 
-u32 GetMonFriendshipScore(struct Pokemon *pokemon)
+u32 GetBattlerFriendshipScore(u8 battlerId)
 {
-    u32 friendshipScore = GetMonData(pokemon, MON_DATA_FRIENDSHIP);
+    struct MegaEvolutionData *mega = &(((struct ChooseMoveStruct *)(&gBattleResources->bufferA[battlerId][4]))->mega);
+    u8 side = GetBattlerSide(battlerId);
+    struct Pokemon *party = (side == B_SIDE_PLAYER) ? gPlayerParty : gEnemyParty;
 
-    if (friendshipScore == MAX_FRIENDSHIP)
-        return FRIENDSHIP_MAX;
-    if (friendshipScore >= 200)
-        return FRIENDSHIP_200_TO_254;
-    if (friendshipScore >= 150)
-        return FRIENDSHIP_150_TO_199;
-    if (friendshipScore >= 100)
-        return FRIENDSHIP_100_TO_149;
-    if (friendshipScore >= 50)
-        return FRIENDSHIP_50_TO_99;
-    if (friendshipScore >= 1)
-        return FRIENDSHIP_1_TO_49;
+    if (side != B_SIDE_PLAYER)
+        return FRIENDSHIP_NONE;
+    else if (gBattleStruct->mega.didMegaEvo[battlerId][side]
+          || (gBattleTypeFlags & (BATTLE_TYPE_EREADER_TRAINER
+                                | BATTLE_TYPE_FRONTIER
+                                | BATTLE_TYPE_LINK
+                                | BATTLE_TYPE_RECORDED_LINK
+                                | BATTLE_TYPE_SECRET_BASE)))
+        return FRIENDSHIP_NONE;
 
-    return FRIENDSHIP_NONE;
+    return GetMonFriendshipScore(&party[gBattlerPartyIndexes[battlerId]]);
 }
 
 enum
@@ -2605,7 +2604,7 @@ u8 DoFieldEndTurnEffects(void)
             {
             #if B_AFFECTION_MECHANICS == TRUE
                 if (GetBattlerSide(gBattlerAttacker) == B_SIDE_PLAYER
-                 && GetMonFriendshipScore(&gPlayerParty[gBattlerPartyIndexes[gBattlerAttacker]]) >= FRIENDSHIP_150_TO_199
+                 && GetBattlerFriendshipScore(gBattlerAttacker) >= FRIENDSHIP_150_TO_199
                  && (Random() % 100 < 20))
                 {
                     gBattleCommunication[MULTISTRING_CHOOSER] = 1;
diff --git a/src/pokemon.c b/src/pokemon.c
index 92bd923f08..61c72c363e 100644
--- a/src/pokemon.c
+++ b/src/pokemon.c
@@ -8384,3 +8384,23 @@ bool32 ShouldShowFemaleDifferences(u16 species, u32 personality)
 {
     return (gBaseStats[species].flags & FLAG_GENDER_DIFFERENCE) && GetGenderFromSpeciesAndPersonality(species, personality) == MON_FEMALE;
 }
+
+u32 GetMonFriendshipScore(struct Pokemon *pokemon)
+{
+    u32 friendshipScore = GetMonData(pokemon, MON_DATA_FRIENDSHIP, NULL);
+
+    if (friendshipScore == MAX_FRIENDSHIP)
+        return FRIENDSHIP_MAX;
+    if (friendshipScore >= 200)
+        return FRIENDSHIP_200_TO_254;
+    if (friendshipScore >= 150)
+        return FRIENDSHIP_150_TO_199;
+    if (friendshipScore >= 100)
+        return FRIENDSHIP_100_TO_149;
+    if (friendshipScore >= 50)
+        return FRIENDSHIP_50_TO_99;
+    if (friendshipScore >= 1)
+        return FRIENDSHIP_1_TO_49;
+
+    return FRIENDSHIP_NONE;
+}