diff --git a/data/mods/gen1/moves.ts b/data/mods/gen1/moves.ts
index ba21a2506c..a219633070 100644
--- a/data/mods/gen1/moves.ts
+++ b/data/mods/gen1/moves.ts
@@ -458,6 +458,22 @@ export const Moves: import('../../../sim/dex-moves').ModdedMoveDataTable = {
 		target: "self",
 		type: "Psychic",
 	},
+	metronome: {
+		inherit: true,
+		onHit(pokemon) {
+			const moves = this.dex.moves.all().filter(move => (
+				(!move.isNonstandard || move.isNonstandard === 'Unobtainable') && move.flags['metronome']
+			));
+			let randomMove = '';
+			if (moves.length) {
+				moves.sort((a, b) => a.num - b.num);
+				randomMove = this.sample(moves).id;
+			}
+			if (!randomMove) return false;
+			pokemon.side.lastSelectedMove = this.toID(randomMove);
+			this.actions.useMove(randomMove, pokemon);
+		},
+	},
 	mimic: {
 		inherit: true,
 		flags: { protect: 1, bypasssub: 1, metronome: 1 },
diff --git a/data/mods/gen1/scripts.ts b/data/mods/gen1/scripts.ts
index 118b5ac213..7aa7786f21 100644
--- a/data/mods/gen1/scripts.ts
+++ b/data/mods/gen1/scripts.ts
@@ -25,6 +25,25 @@ export const Scripts: ModdedBattleScriptsData = {
 	// BattlePokemon scripts.
 	pokemon: {
 		inherit: true,
+		// In gen 1, a Pokémon can have two instances of the same move using Mimic
+		// we need to make sure to deduct PP from a move that has PP left
+		deductPP(move, amount, target) {
+			move = this.battle.dex.moves.get(move);
+			// first loop: get the first instance with PP left
+			// second loop: get the first instance, even if it has no PP left
+			for (let i = 0; i < 2; i++) {
+				for (const ppData of this.moveSlots) {
+					if (ppData.id !== move.id) continue;
+					ppData.used = true;
+					if (!ppData.pp && i === 0) continue;
+
+					if (!amount) amount = 1;
+					ppData.pp -= amount;
+					return amount;
+				}
+			}
+			return 0;
+		},
 		getStat(statName, unmodified) {
 			// @ts-expect-error type checking prevents 'hp' from being passed, but we're paranoid
 			if (statName === 'hp') throw new Error("Please read `maxhp` directly");
diff --git a/data/mods/gen4/moves.ts b/data/mods/gen4/moves.ts
index 1acc40facf..848090153c 100644
--- a/data/mods/gen4/moves.ts
+++ b/data/mods/gen4/moves.ts
@@ -1087,9 +1087,8 @@ export const Moves: import('../../../sim/dex-moves').ModdedMoveDataTable = {
 		flags: { noassist: 1, failcopycat: 1, nosleeptalk: 1, failmimic: 1 },
 		onHit(pokemon) {
 			const moves = this.dex.moves.all().filter(move => (
-				(![2, 4].includes(this.gen) || !pokemon.moves.includes(move.id)) &&
+				move.flags['metronome'] && !pokemon.moves.includes(move.id) &&
 				(!move.isNonstandard || move.isNonstandard === 'Unobtainable') &&
-				move.flags['metronome'] &&
 				!(this.field.pseudoWeather['gravity'] && move.flags['gravity']) &&
 				!(pokemon.volatiles['healblock'] && move.flags['heal'])
 			));
diff --git a/data/mods/gen7letsgo/moves.ts b/data/mods/gen7letsgo/moves.ts
index 552a0df8c8..31f669b0e1 100644
--- a/data/mods/gen7letsgo/moves.ts
+++ b/data/mods/gen7letsgo/moves.ts
@@ -41,8 +41,11 @@ export const Moves: import('../../../sim/dex-moves').ModdedMoveDataTable = {
 		inherit: true,
 		desc: "A random move that was introduced in gen 1 is selected for use, other than Counter, Mimic, Mirror Move, Struggle, or Transform.",
 		shortDesc: "Picks a random move from gen 1.",
-		onHit(target, source, effect) {
-			const moves = this.dex.moves.all().filter(move => move.gen === 1 && move.flags['metronome']);
+		onHit(target) {
+			const moves = this.dex.moves.all().filter(move => (
+				(!move.isNonstandard || move.isNonstandard === 'Unobtainable') &&
+				move.flags['metronome'] && move.gen === 1
+			));
 			let randomMove = '';
 			if (moves.length) {
 				moves.sort((a, b) => a.num - b.num);
diff --git a/sim/pokemon.ts b/sim/pokemon.ts
index 418bdc3bd2..6ff69ec153 100644
--- a/sim/pokemon.ts
+++ b/sim/pokemon.ts
@@ -876,16 +876,15 @@ export class Pokemon {
 	}
 
 	deductPP(move: string | Move, amount?: number | null, target?: Pokemon | null | false) {
-		const gen = this.battle.gen;
 		move = this.battle.dex.moves.get(move);
 		const ppData = this.getMoveData(move);
 		if (!ppData) return 0;
 		ppData.used = true;
-		if (!ppData.pp && gen > 1) return 0;
+		if (!ppData.pp) return 0;
 
 		if (!amount) amount = 1;
 		ppData.pp -= amount;
-		if (ppData.pp < 0 && gen > 1) {
+		if (ppData.pp < 0) {
 			amount += ppData.pp;
 			ppData.pp = 0;
 		}