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How to beat Koraidon ex

Koraidon ex has 2 versions in the 2026–27 Standard format, with up to 230 HP as a Fighting Pokémon. Here's the maths for Knocking it Out — worked out from every Standard-legal card.

HP

230

Weakness

Psychic

Resistance

None

Prizes

2

One-hit KOs

89

Fastest KO

1 Energy

Game plan

1. Hit its Weakness. Koraidon ex is weak to Psychic, so those attacks do double damage. 40 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 2 Prize cards when Knocked Out. 39 single-Prize Pokémon can take it out in one attack, so you trade 1 Prize for 2.
3. Plan for its big hit. Its strongest printed attack is Kaiser Tackle for 280 (3 Energy). 69 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 230 after Weakness. Fastest (fewest Energy) first.

One-hit Knock Outs without Weakness

Attacks with a printed 230+ damage.

Best Prize trades

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

Pokémon that survive its biggest attack

These can take a printed 280 from Kaiser Tackle and stay in play (Weakness included). Single-Prize Pokémon first.

Every Standard Koraidon 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 Koraidon cards in Standard · how to knock out a 230 HP Pokémon · Psychic vs Fighting · beating big Pokémon ex · more counter guides

Questions people ask

What is Koraidon ex weak to?

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

How much HP does Koraidon ex have?

Up to 230 HP in Standard (230 on the Ascended Heroes version, 230 on the Temporal Forces version).

How many Prize cards does Koraidon ex give up?

2 — it's a Pokémon ex.

What can one-hit KO Koraidon ex?

89 Standard cards can, going by printed damage. The fastest: Palafin ex's Giga Impact (1 Energy, 250 damage); Tinkaton's Windup Swing (1 Energy, 240 damage); Iron Boulder's Adjusted Horn (2 Energy, 340 damage).

What is Koraidon ex's strongest attack?

Kaiser Tackle, which prints 280 damage for 3 Energy.