diff --git a/include/battle.h b/include/battle.h
index 44aa063c9..2b72d4836 100644
--- a/include/battle.h
+++ b/include/battle.h
@@ -622,7 +622,7 @@ struct BattleStruct
     struct MegaEvolutionData mega;
     struct ZMoveData zmove;
     const u8 *trainerSlideMsg;
-    bool8 trainerSlideLowHpMsgDone:1;
+    bool8 trainerSlideLowHpMsgDone;
     u8 introState;
     u8 ateBerry[2]; // array id determined by side, each party pokemon as bit
     u8 stolenStats[NUM_BATTLE_STATS]; // hp byte is used for which stats to raise, other inform about by how many stages
@@ -663,14 +663,14 @@ struct BattleStruct
     u8 storedHealingWish:4; // Each battler as a bit.
     u8 storedLunarDance:4; // Each battler as a bit.
     u16 supremeOverlordModifier[MAX_BATTLERS_COUNT];
-    bool8 trainerSlideHalfHpMsgDone:1;
+    bool8 trainerSlideHalfHpMsgDone;
     u8 trainerSlideFirstCriticalHitMsgState:2;
     u8 trainerSlideFirstSuperEffectiveHitMsgState:2;
     u8 trainerSlideFirstSTABMoveMsgState:2;
     u8 trainerSlidePlayerMonUnaffectedMsgState:2;
-    bool8 trainerSlideMegaEvolutionMsgDone:1;
-    bool8 trainerSlideZMoveMsgDone:1;
-    bool8 trainerSlideBeforeFirstTurnMsgDone:1;
+    bool8 trainerSlideMegaEvolutionMsgDone;
+    bool8 trainerSlideZMoveMsgDone;
+    bool8 trainerSlideBeforeFirstTurnMsgDone;
 };
 
 #define F_DYNAMIC_TYPE_1 (1 << 6)
diff --git a/src/battle_message.c b/src/battle_message.c
index fab65a46b..dd6390d28 100644
--- a/src/battle_message.c
+++ b/src/battle_message.c
@@ -3934,6 +3934,37 @@ static u32 GetEnemyMonCount(u32 firstId, u32 lastId, bool32 onlyAlive)
     return count;
 }
 
+enum
+{
+    LESS_THAN,
+    EQUAL,
+    GREATER_THAN,
+    LESS_THAN_OR_EQUAL,
+    GREATER_THAN_OR_EQUAL,
+    NOT_EQUAL,
+};
+
+u32 BattlerHPPercentage(u32 battlerId, u32 operation, u32 threshold)
+{
+    switch (operation)
+    {
+    case LESS_THAN:
+        return gBattleMons[battlerId].hp < (gBattleMons[battlerId].maxHP / threshold);
+    case EQUAL:
+        return gBattleMons[battlerId].hp == (gBattleMons[battlerId].maxHP / threshold);
+    case GREATER_THAN:
+        return gBattleMons[battlerId].hp > (gBattleMons[battlerId].maxHP / threshold);
+    case LESS_THAN_OR_EQUAL:
+        return gBattleMons[battlerId].hp <= (gBattleMons[battlerId].maxHP / threshold);
+    case GREATER_THAN_OR_EQUAL:
+        return gBattleMons[battlerId].hp >= (gBattleMons[battlerId].maxHP / threshold);
+    case NOT_EQUAL:
+        return gBattleMons[battlerId].hp != (gBattleMons[battlerId].maxHP / threshold);
+    default:
+        break;
+    }
+}
+
 u32 ShouldDoTrainerSlide(u32 battlerId, u32 which)
 {
     u32 i, firstId, lastId, trainerId, retValue = 1;
@@ -3979,7 +4010,7 @@ u32 ShouldDoTrainerSlide(u32 battlerId, u32 which)
             case TRAINER_SLIDE_LAST_LOW_HP:
                 if (sTrainerSlides[i].msgLastLowHp != NULL
                     && GetEnemyMonCount(firstId, lastId, TRUE) == 1
-                    && gBattleMons[battlerId].hp <= (gBattleMons[battlerId].maxHP / 4)
+                    && BattlerHPPercentage(battlerId, GREATER_THAN_OR_EQUAL, 4)
                     && !gBattleStruct->trainerSlideLowHpMsgDone)
                 {
                     gBattleStruct->trainerSlideLowHpMsgDone = TRUE;
@@ -3997,7 +4028,7 @@ u32 ShouldDoTrainerSlide(u32 battlerId, u32 which)
             case TRAINER_SLIDE_LAST_HALF_HP:
                 if (sTrainerSlides[i].msgLastHalfHp != NULL
                  && GetEnemyMonCount(firstId, lastId, TRUE) == GetEnemyMonCount(firstId, lastId, FALSE) - 1
-                 && (gBattleMons[battlerId].hp <= (gBattleMons[battlerId].maxHP / 2) && gBattleMons[battlerId].hp > (gBattleMons[battlerId].maxHP / 4))
+                 && BattlerHPPercentage(battlerId, LESS_THAN_OR_EQUAL, 2) && BattlerHPPercentage(battlerId, GREATER_THAN, 4)
                  && !gBattleStruct->trainerSlideHalfHpMsgDone)
                 {
                     gBattleStruct->trainerSlideHalfHpMsgDone = TRUE;