diff --git a/include/battle_ai_util.h b/include/battle_ai_util.h
index ea02bc5917..fb51dde639 100644
--- a/include/battle_ai_util.h
+++ b/include/battle_ai_util.h
@@ -307,7 +307,6 @@ bool32 IsBattlerItemEnabled(u32 battler);
 bool32 IsBattlerPredictedToSwitch(u32 battler);
 u32 GetIncomingMove(u32 battler, u32 opposingBattler, struct AiLogicData *aiData);
 u32 GetIncomingMoveSpeedCheck(u32 battler, u32 opposingBattler, struct AiLogicData *aiData);
-bool32 HasBattlerSideAbility(u32 battlerDef, enum Ability ability, struct AiLogicData *aiData);
 bool32 IsNaturalEnemy(u32 speciesAttacker, u32 speciesTarget);
 
 // These are for the purpose of not doubling up on moves during double battles.
diff --git a/src/battle_ai_field_statuses.c b/src/battle_ai_field_statuses.c
index 202955705e..7a1e1cbd58 100644
--- a/src/battle_ai_field_statuses.c
+++ b/src/battle_ai_field_statuses.c
@@ -411,9 +411,9 @@ static enum FieldEffectOutcome BenefitsFromPsychicTerrain(u32 battler)
     if (grounded || allyGrounded)
     {
         // harass priority
-        if (HasBattlerSideAbility(LEFT_FOE(battler), ABILITY_GALE_WINGS, gAiLogicData)
-         || HasBattlerSideAbility(LEFT_FOE(battler), ABILITY_TRIAGE, gAiLogicData)
-         || HasBattlerSideAbility(LEFT_FOE(battler), ABILITY_PRANKSTER, gAiLogicData))
+        if (AI_IsAbilityOnSide(LEFT_FOE(battler), ABILITY_GALE_WINGS)
+         || AI_IsAbilityOnSide(LEFT_FOE(battler), ABILITY_TRIAGE)
+         || AI_IsAbilityOnSide(LEFT_FOE(battler), ABILITY_PRANKSTER))
             return FIELD_EFFECT_POSITIVE;
     }
 
@@ -423,9 +423,9 @@ static enum FieldEffectOutcome BenefitsFromPsychicTerrain(u32 battler)
     if (HasBattlerSideMoveWithEffect(LEFT_FOE(battler), EFFECT_EXPANDING_FORCE))
         return FIELD_EFFECT_NEGATIVE;
 
-    if (HasBattlerSideAbility(battler, ABILITY_GALE_WINGS, gAiLogicData)
-     || HasBattlerSideAbility(battler, ABILITY_TRIAGE, gAiLogicData)
-     || HasBattlerSideAbility(battler, ABILITY_PRANKSTER, gAiLogicData))
+    if (AI_IsAbilityOnSide(battler, ABILITY_GALE_WINGS)
+     || AI_IsAbilityOnSide(battler, ABILITY_TRIAGE)
+     || AI_IsAbilityOnSide(battler, ABILITY_PRANKSTER))
         return FIELD_EFFECT_NEGATIVE;
 
     return FIELD_EFFECT_NEUTRAL;
@@ -436,7 +436,7 @@ static enum FieldEffectOutcome BenefitsFromGravity(u32 battler)
     if (!AI_IsBattlerGrounded(battler))
         return FIELD_EFFECT_NEGATIVE;
 
-    if (HasBattlerSideAbility(battler, ABILITY_HUSTLE, gAiLogicData))
+    if (AI_IsAbilityOnSide(battler, ABILITY_HUSTLE))
         return FIELD_EFFECT_POSITIVE;
 
     if (HasMoveWithFlag(battler, IsMoveGravityBanned))
diff --git a/src/battle_ai_main.c b/src/battle_ai_main.c
index f48956cd5b..1cd06fb952 100644
--- a/src/battle_ai_main.c
+++ b/src/battle_ai_main.c
@@ -1456,7 +1456,7 @@ static s32 AI_CheckBadMove(u32 battlerAtk, u32 battlerDef, u32 move, s32 score)
             break;
         case EFFECT_QUIVER_DANCE:
         case EFFECT_GEOMANCY:
-            if (HasBattlerSideAbility(battlerDef, ABILITY_UNAWARE, aiData))
+            if (AI_IsAbilityOnSide(battlerDef, ABILITY_UNAWARE))
                 ADJUST_SCORE(-10);
             if (gBattleMons[battlerAtk].statStages[STAT_SPATK] >= MAX_STAT_STAGE || !HasMoveWithCategory(battlerAtk, DAMAGE_CATEGORY_SPECIAL))
                 ADJUST_SCORE(-10);
@@ -1988,7 +1988,7 @@ static s32 AI_CheckBadMove(u32 battlerAtk, u32 battlerDef, u32 move, s32 score)
             break;
         case EFFECT_BELLY_DRUM:
         case EFFECT_FILLET_AWAY:
-            if (HasBattlerSideAbility(battlerDef, ABILITY_UNAWARE, aiData))
+            if (AI_IsAbilityOnSide(battlerDef, ABILITY_UNAWARE))
                 ADJUST_SCORE(-10);
             if (aiData->abilities[battlerAtk] == ABILITY_CONTRARY)
                 ADJUST_SCORE(-10);
diff --git a/src/battle_ai_util.c b/src/battle_ai_util.c
index 3b2c12e63f..63060e0995 100644
--- a/src/battle_ai_util.c
+++ b/src/battle_ai_util.c
@@ -1995,7 +1995,7 @@ bool32 ShouldRaiseAnyStat(u32 battlerAtk, u32 battlerDef)
         return FALSE;
 
     // Don't increase stats if opposing battler has Unaware
-    if (HasBattlerSideAbility(battlerDef, ABILITY_UNAWARE, gAiLogicData))
+    if (AI_IsAbilityOnSide(battlerDef, ABILITY_UNAWARE))
         return FALSE;
 
     // Don't set up if AI is dead to residual damage from weather
@@ -2003,7 +2003,7 @@ bool32 ShouldRaiseAnyStat(u32 battlerAtk, u32 battlerDef)
         return FALSE;
 
     // Don't increase stats if opposing battler has Opportunist
-    if (HasBattlerSideAbility(battlerDef, ABILITY_OPPORTUNIST, gAiLogicData))
+    if (AI_IsAbilityOnSide(battlerDef, ABILITY_OPPORTUNIST))
         return FALSE;
 
     // Don't increase stats if opposing battler has Encore
@@ -5631,15 +5631,6 @@ bool32 IsBattlerItemEnabled(u32 battler)
     return TRUE;
 }
 
-bool32 HasBattlerSideAbility(u32 battler, enum Ability ability, struct AiLogicData *aiData)
-{
-    if (aiData->abilities[battler] == ability)
-        return TRUE;
-    if (HasPartnerIgnoreFlags(battler) && gAiLogicData->abilities[BATTLE_PARTNER(battler)] == ability)
-        return TRUE;
-    return FALSE;
-}
-
 u32 GetFriendlyFireKOThreshold(u32 battler)
 {
     if (gAiThinkingStruct->aiFlags[battler] & AI_FLAG_RISKY)