Fix optimizer output when new spread has a 0 (#2241)

Author: pyuk-bot

play.pokemonshowdown.com/src/battle-tooltips.ts

@@ -3015,15 +3015,13 @@ function BattleStatOptimizer(set: PokemonSet, formatid: ID) {
 			minus?: StatNameExceptHP,
 		} = {evs: {...origSpread.evs}, plus: bestPlus, minus: bestMinus};
 		if (bestPlus !== origNature.plus || bestMinus !== origNature.minus) {
-			if (bestPlusMinEVs) newSpread.evs[bestPlus] = bestPlusMinEVs;
-			if (bestMinusMinEVs) newSpread.evs[bestMinus] = bestMinusMinEVs;
+			newSpread.evs[bestPlus] = bestPlusMinEVs!;
+			newSpread.evs[bestMinus] = bestMinusMinEVs!;
 			if (origNature.plus && origNature.plus !== bestPlus && origNature.plus !== bestMinus) {
-				const oldPlusEVs = getMinEVs(origNature.plus, newSpread);
-				if (oldPlusEVs) newSpread.evs[origNature.plus] = oldPlusEVs;
+				newSpread.evs[origNature.plus] = getMinEVs(origNature.plus, newSpread);
 			}
 			if (origNature.minus && origNature.minus !== bestPlus && origNature.minus !== bestMinus) {
-				const oldMinusEVS = getMinEVs(origNature.minus, newSpread);
-				if (oldMinusEVS) newSpread.evs[origNature.minus] = oldMinusEVS;
+				newSpread.evs[origNature.minus] = getMinEVs(origNature.minus, newSpread);
 			}
 			for (const stat of Dex.statNames) {
 				if (!newSpread.evs[stat]) delete newSpread.evs[stat];

test/ev-optimizer.test.js

@@ -94,6 +94,19 @@ describe('EV Optimizer', () => {
     }, 'gen9');
     assert.equal(mew2, null);
 
+    const greatTusk = BattleStatOptimizer({
+      species: "Great Tusk",
+      nature: "Jolly",
+      evs: {hp: 136, atk: 92, def: 100, spd: 72, spe: 108},
+      level: 100
+    }, 'gen9');
+    assert.deepStrictEqual(greatTusk, {
+      evs: {hp: 136, atk: 92, spd: 72, spe: 200},
+      plus: 'def',
+      minus: 'spa',
+      savedEVs: 8,
+    });
+    
     const mienfoo = BattleStatOptimizer({
       species: "Mienfoo",
       nature: "Jolly",