diff --git a/include/constants/battle_config.h b/include/constants/battle_config.h
index 6f4e283ca5..5e6c7d7293 100644
--- a/include/constants/battle_config.h
+++ b/include/constants/battle_config.h
@@ -51,6 +51,7 @@
     #define SPECIES_MELOETTA_PIROUETTE      10019
     #define SPECIES_MORPEKO                 0
     #define SPECIES_MORPEKO_HANGRY          10020
+    #define SPECIES_SIRFETCHD               10021
 #endif
 
 // Items with peculiar battle effects.
@@ -185,6 +186,7 @@
 #define B_HEAVY_BALL_MODIFIER       GEN_7 // In Gen7+, Heavy Ball's ranges change. See Cmd_handleballthrow.
 #define B_DREAM_BALL_MODIFIER       GEN_8 // In Gen8, Dream Ball's catch multiplier is x4 when the target is asleep or has the ability Comatose.
 #define B_SERENE_GRACE_BOOST        GEN_7 // In Gen5+, Serene Grace boosts the added flinch chance of King's Rock and Razor Fang.
+#define B_LEEK_ALWAYS_CRIT          GEN_7 // In Gen6+, if a Farfetch'd or Sirfetch'd holding a Leek use a move with increased Critical Hit ratio, it will always result in a Critical Hit.
 
 // Flag settings
 // To use the following features in scripting, replace the 0s with the flag ID you're assigning it to.
diff --git a/src/battle_script_commands.c b/src/battle_script_commands.c
index 4a5b09df37..7923a67395 100644
--- a/src/battle_script_commands.c
+++ b/src/battle_script_commands.c
@@ -1861,11 +1861,13 @@ static void Cmd_ppreduce(void)
     static const u8 sCriticalHitChance[] = {16, 8, 4, 3, 2}; // Gens 2,3,4,5
 #endif // B_CRIT_CHANCE
 
+#define BENEFITS_FROM_LEEK(battler, holdEffect)((holdEffect == HOLD_EFFECT_LEEK) && (GET_BASE_SPECIES_ID(gBattleMons[battler].species) == SPECIES_FARFETCHD || gBattleMons[battler].species == SPECIES_SIRFETCHD))
 s32 CalcCritChanceStage(u8 battlerAtk, u8 battlerDef, u32 move, bool32 recordAbility)
 {
     s32 critChance = 0;
     u32 abilityAtk = GetBattlerAbility(gBattlerAttacker);
     u32 abilityDef = GetBattlerAbility(gBattlerTarget);
+    u32 holdEffectAtk = GetBattlerHoldEffect(battlerAtk, TRUE);
 
     if (gSideStatuses[battlerDef] & SIDE_STATUS_LUCKY_CHANT
         || gStatuses3[gBattlerAttacker] & STATUS3_CANT_SCORE_A_CRIT)
@@ -1881,19 +1883,21 @@ s32 CalcCritChanceStage(u8 battlerAtk, u8 battlerDef, u32 move, bool32 recordAbi
     else if (gStatuses3[battlerAtk] & STATUS3_LASER_FOCUS
              || gBattleMoves[move].effect == EFFECT_ALWAYS_CRIT
              || (abilityAtk == ABILITY_MERCILESS && gBattleMons[battlerDef].status1 & STATUS1_PSN_ANY)
-             || move == MOVE_SURGING_STRIKES)
+             || move == MOVE_SURGING_STRIKES
+            #if B_LEEK_ALWAYS_CRIT >= GEN_6
+             || ((gBattleMoves[gCurrentMove].flags & FLAG_HIGH_CRIT) && BENEFITS_FROM_LEEK(battlerAtk, holdEffectAtk))
+            #endif
+             )
     {
         critChance = -2;
     }
     else
     {
-        u32 holdEffectAtk = GetBattlerHoldEffect(battlerAtk, TRUE);
-
         critChance  = 2 * ((gBattleMons[gBattlerAttacker].status2 & STATUS2_FOCUS_ENERGY) != 0)
                     + ((gBattleMoves[gCurrentMove].flags & FLAG_HIGH_CRIT) != 0)
                     + (holdEffectAtk == HOLD_EFFECT_SCOPE_LENS)
                     + 2 * (holdEffectAtk == HOLD_EFFECT_LUCKY_PUNCH && gBattleMons[gBattlerAttacker].species == SPECIES_CHANSEY)
-                    + 2 * (holdEffectAtk == HOLD_EFFECT_LEEK && gBattleMons[gBattlerAttacker].species == SPECIES_FARFETCHD)
+                    + 2 * BENEFITS_FROM_LEEK(battlerAtk, holdEffectAtk)
                     + (abilityAtk == ABILITY_SUPER_LUCK);
 
         if (critChance >= ARRAY_COUNT(sCriticalHitChance))
@@ -1902,6 +1906,7 @@ s32 CalcCritChanceStage(u8 battlerAtk, u8 battlerDef, u32 move, bool32 recordAbi
 
     return critChance;
 }
+#undef BENEFITS_FROM_LEEK
 
 s8 GetInverseCritChance(u8 battlerAtk, u8 battlerDef, u32 move)
 {
@@ -8966,11 +8971,11 @@ static void Cmd_various(void)
 
         for (i = 0; i < gBattlersCount; i++)
         {
-            if (((GetBattlerAbility(i) == ABILITY_DESOLATE_LAND && gBattleWeather & WEATHER_SUN_PRIMAL)
-             || (GetBattlerAbility(i) == ABILITY_PRIMORDIAL_SEA && gBattleWeather & WEATHER_RAIN_PRIMAL)
-             || (GetBattlerAbility(i) == ABILITY_DELTA_STREAM && gBattleWeather & WEATHER_STRONG_WINDS))
-             && IsBattlerAlive(i)
-             && !(gStatuses3[i] & STATUS3_GASTRO_ACID))
+            u32 ability = GetBattlerAbility(i);
+            if (((ability == ABILITY_DESOLATE_LAND && gBattleWeather & WEATHER_SUN_PRIMAL)
+             || (ability == ABILITY_PRIMORDIAL_SEA && gBattleWeather & WEATHER_RAIN_PRIMAL)
+             || (ability == ABILITY_DELTA_STREAM && gBattleWeather & WEATHER_STRONG_WINDS))
+             && IsBattlerAlive(i))
                 shouldNotClear = TRUE;
         }
         if (gBattleWeather & WEATHER_SUN_PRIMAL && !shouldNotClear)
diff --git a/src/battle_util.c b/src/battle_util.c
index 1e29695e25..6eb95d848a 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -7462,7 +7462,7 @@ u32 GetBattlerHoldEffect(u8 battlerId, bool32 checkNegating)
             return HOLD_EFFECT_NONE;
         if (gFieldStatuses & STATUS_FIELD_MAGIC_ROOM)
             return HOLD_EFFECT_NONE;
-        if (GetBattlerAbility(battlerId) == ABILITY_KLUTZ && !(gStatuses3[battlerId] & STATUS3_GASTRO_ACID))
+        if (GetBattlerAbility(battlerId) == ABILITY_KLUTZ)
             return HOLD_EFFECT_NONE;
     }