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How to beat Mega Lucario ex

Mega Lucario ex has 1 version in the 2026–27 Standard format, with up to 340 HP as a Fighting Pokémon. Here's the maths for Knocking it Out — worked out from every Standard-legal card.

HP

340

Weakness

Psychic

Resistance

None

Prizes

3

One-hit KOs

8

Fastest KO

2 Energy

Game plan

1. Hit its Weakness. Mega Lucario ex is weak to Psychic, so those attacks do double damage. 8 Standard cards can Knock it Out in one hit that way — the fastest needs just 2 Energy.
2. Win the Prize trade. It gives up 3 Prize cards when Knocked Out. 4 single-Prize Pokémon can take it out in one attack, so you trade 1 Prize for 3.
3. Plan for its big hit. Its strongest printed attack is Mega Brave for 270 (2 Energy). 79 Standard cards have enough HP to survive one hit — before any Weakness, + or × effects.
4. 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 Psychic attacks do at least 340 after Weakness. Fastest (fewest Energy) first.

One-hit Knock Outs without Weakness

Attacks with a printed 340+ damage.

None in Standard right now.

Best Prize trades

Single-Prize Pokémon that Knock Out Mega Lucario ex in one attack — you give up 1 Prize, they give up 3.

Two-hit plans

Not many cards one-shot it, so here are attacks that do at least 170 — two hits and it's gone.

Pokémon that survive its biggest attack

These can take a printed 270 from Mega Brave and stay in play (Weakness included). Single-Prize Pokémon first.

Every Standard Mega Lucario 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 Lucario cards in Standard · how to knock out a 340 HP Pokémon · Psychic vs Fighting · beating big Pokémon ex · more counter guides

Questions people ask

What is Mega Lucario ex weak to?

Mega Lucario ex is weak to Psychic, so those attacks do double damage (×2).

How much HP does Mega Lucario ex have?

Up to 340 HP in Standard.

How many Prize cards does Mega Lucario ex give up?

3 — it's a Mega Evolution Pokémon ex.

What can one-hit KO Mega Lucario ex?

8 Standard cards can, going by printed damage. The fastest: Iron Boulder's Adjusted Horn (2 Energy, 340 damage); Mewtwo ex's Psychic Powers (3 Energy, 460 damage); Steven's Claydol's Clay Blast (3 Energy, 440 damage).

What is Mega Lucario ex's strongest attack?

Mega Brave, which prints 270 damage for 2 Energy.