How to beat Mewtwo ex

Mewtwo ex has 1 version in the 2026–27 Standard format, with up to 230 HP as a Psychic Pokémon. Here's the maths for Knocking it Out — worked out from every Standard-legal card.

Game plan

1. Hit its Weakness. Mewtwo ex is weak to Darkness, so those attacks do double damage. 42 Standard cards can Knock it Out in one hit that way — the fastest needs just 1 Energy.
2. Win the Prize trade. It gives up 2 Prize cards when Knocked Out. 37 single-Prize Pokémon can take it out in one attack, so you trade 1 Prize for 2.
3. Avoid Fighting attacks. Mewtwo ex resists them, so they do less damage.
4. Plan for its big hit. Its strongest printed attack is Psychic Powers for 230 (3 Energy). 135 Standard cards have enough HP to survive one hit — before any Weakness, + or × effects.
5. Watch the Retreat Cost. It costs 2 Energy to retreat. If it gets stuck in the Active Spot, that's your chance.

One-hit Knock Outs using Weakness

These Darkness attacks do at least 230 after Weakness. Fastest (fewest Energy) first.

One-hit Knock Outs without Weakness

Attacks with a printed 230+ damage (after Resistance).

Best Prize trades

Single-Prize Pokémon that Knock Out Mewtwo ex in one attack — you give up 1 Prize, they give up 2.

Pokémon that survive its biggest attack

These can take a printed 230 from Psychic Powers and stay in play (Weakness included). Single-Prize Pokémon first.

Every Standard Mewtwo ex card

Damage is the number printed on the card. Attacks marked + or × can do more, and Abilities, Tools and Stadiums can change the maths — always read the card. Energy letters: G Grass, R Fire, W Water, L Lightning, P Psychic, F Fighting, D Darkness, M Metal, N Dragon, C Colorless (any Energy).

Related: all Mewtwo cards in Standard · how to knock out a 230 HP Pokémon · Darkness vs Psychic · beating big Pokémon ex · more counter guides

Questions people ask

What is Mewtwo ex weak to?

Mewtwo ex is weak to Darkness, so those attacks do double damage (×2).

How much HP does Mewtwo ex have?

Up to 230 HP in Standard.

How many Prize cards does Mewtwo ex give up?

2 — it's a Pokémon ex.

What can one-hit KO Mewtwo ex?

88 Standard cards can, going by printed damage. The fastest: Malamar's Brain Crush (1 Energy, 260 damage); Palafin ex's Giga Impact (1 Energy, 250 damage); Tinkaton's Windup Swing (1 Energy, 240 damage).

What is Mewtwo ex's strongest attack?

Psychic Powers, which prints 230 damage for 3 Energy.

What does Mewtwo ex resist?

Fighting — those attacks do less damage to it.