diff --git a/calc/src/mechanics/gen12.ts b/calc/src/mechanics/gen12.ts
index c5690f569..35acf35ff 100644
--- a/calc/src/mechanics/gen12.ts
+++ b/calc/src/mechanics/gen12.ts
@@ -74,6 +74,12 @@ export function calculateRBYGSC(
     }
   }
 
+  // In Gen 1, Super Fang can hit Ghost types
+  if (gen.num === 1 && (move.named('Super Fang'))) {
+    const lostHP = Math.floor(defender.curHP() / 2) || 1;
+    result.damage = lostHP;
+    return result;
+  }
 
   const type1Effectiveness =
     getMoveEffectiveness(gen, move, firstDefenderType, field.defenderSide.isForesight);
diff --git a/calc/src/mechanics/gen3.ts b/calc/src/mechanics/gen3.ts
index f3f7474ee..ee6febd97 100644
--- a/calc/src/mechanics/gen3.ts
+++ b/calc/src/mechanics/gen3.ts
@@ -122,6 +122,12 @@ export function calculateADV(
 
   desc.HPEVs = `${defender.evs.hp} HP`;
 
+  if (move.named('Super Fang')) {
+    const lostHP = Math.floor(defender.curHP() / 2) || 1;
+    result.damage = lostHP;
+    return result;
+  }
+
   const fixedDamage = handleFixedDamageMoves(attacker, move);
   if (fixedDamage) {
     result.damage = fixedDamage;
diff --git a/calc/src/mechanics/gen4.ts b/calc/src/mechanics/gen4.ts
index fbcc2da6f..7fc14faf5 100644
--- a/calc/src/mechanics/gen4.ts
+++ b/calc/src/mechanics/gen4.ts
@@ -174,6 +174,12 @@ export function calculateDPP(
 
   desc.HPEVs = `${defender.evs.hp} HP`;
 
+  if (move.named('Super Fang')) {
+    const lostHP = Math.floor(defender.curHP() / 2) || 1;
+    result.damage = lostHP;
+    return result;
+  }
+
   const fixedDamage = handleFixedDamageMoves(attacker, move);
   if (fixedDamage) {
     result.damage = fixedDamage;
diff --git a/calc/src/mechanics/gen56.ts b/calc/src/mechanics/gen56.ts
index 4640ddf0b..9c5d9386e 100644
--- a/calc/src/mechanics/gen56.ts
+++ b/calc/src/mechanics/gen56.ts
@@ -249,6 +249,12 @@ export function calculateBWXY(
 
   desc.HPEVs = `${defender.evs.hp} HP`;
 
+  if (move.named('Super Fang')) {
+    const lostHP = Math.floor(defender.curHP() / 2) || 1;
+    result.damage = lostHP;
+    return result;
+  }
+
   const fixedDamage = handleFixedDamageMoves(attacker, move);
   if (fixedDamage) {
     if (attacker.hasAbility('Parental Bond')) {
diff --git a/calc/src/mechanics/gen789.ts b/calc/src/mechanics/gen789.ts
index 719f2cdbe..f2f537f6b 100644
--- a/calc/src/mechanics/gen789.ts
+++ b/calc/src/mechanics/gen789.ts
@@ -400,8 +400,8 @@ export function calculateSMSSSV(
     return result;
   }
 
-  if (move.named('Nature\'s Madness')) {
-    const lostHP = field.defenderSide.isProtected ? 0 : Math.floor(defender.curHP() / 2);
+  if (move.named('Nature\'s Madness', 'Super Fang', 'Ruination')) {
+    const lostHP = field.defenderSide.isProtected ? 0 : Math.floor(defender.curHP() / 2) || 1;
     result.damage = lostHP;
     return result;
   }
diff --git a/calc/src/mechanics/util.ts b/calc/src/mechanics/util.ts
index 816ad6388..291c43d6f 100644
--- a/calc/src/mechanics/util.ts
+++ b/calc/src/mechanics/util.ts
@@ -531,7 +531,6 @@ export function handleFixedDamageMoves(attacker: Pokemon, move: Move) {
   }
   return 0;
 }
-
 // Game Freak rounds DOWN on .5
 export function pokeRound(num: number) {
   return num % 1 > 0.5 ? Math.ceil(num) : Math.floor(num);
diff --git a/src/js/moveset_import.js b/src/js/moveset_import.js
index 825c58aaa..8de7f7f5b 100644
--- a/src/js/moveset_import.js
+++ b/src/js/moveset_import.js
@@ -153,7 +153,7 @@ function getStats(currentPoke, rows, offset) {
 		}
 
 		currentNature = rows[x] ? rows[x].trim().split(" ") : '';
-		if (currentNature[1] == "Nature") {
+		if (currentNature[1] == "Nature" && currentNature[2] !== "Power") { // edge case with the move nature power that overwrite nature)
 			currentPoke.nature = currentNature[0];
 		}
 	}