How to beat Decidueye ex

Decidueye ex has 1 version in the 2026–27 Standard format, with up to 320 HP as a Grass Pokémon. Here's the maths for Knocking it Out — worked out from every Standard-legal card.

HP: 320

Weakness: Fire

Resistance: None

Prizes: 2

One-hit KOs: 28

Fastest KO: 1 Energy

Game plan

Hit its Weakness. Decidueye ex is weak to Fire, so those attacks do double damage. 27 Standard cards can Knock it Out in one hit that way — the fastest needs just 1 Energy.
Win the Prize trade. It gives up 2 Prize cards when Knocked Out. 13 single-Prize Pokémon can take it out in one attack, so you trade 1 Prize for 2.
Plan for its big hit. Its strongest printed attack is Crushing Arrow for 240 (4 Energy). 120 Standard cards have enough HP to survive one hit — before any Weakness, + or × effects.
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 Fire attacks do at least 320 after Weakness. Fastest (fewest Energy) first.

Pokémon	Type	Attack	Damage	Damage to Decidueye ex	HP	Prizes
Ceruledge Phantasmal Flames	Fire	Infernal Slash R	220	440	140	1
Blaziken ex Journey Together	Fire	Smolder-sault RC	200	400	320	2
Centiskorch Temporal Forces	Fire	Charring Breath RR	180	360	140	1
Chandelure White Flare	Fire	Burn It All Up RR	180	360	150	1
Mega Emboar ex Ascended Heroes	Fire	Crimson Blast RRC	320	640	380	3
Mega Pyroar ex Chaos Rising	Fire	Fiery Big Bang RRC	290-	580	340	3
Ceruledge ex Prismatic Evolutions	Fire	Raging Amethyst RPM	280	560	270	2
Cinderace ex Ascended Heroes	Fire	Flare Strike RCC	280	560	320	2
Flareon ex Prismatic Evolutions	Fire	Carnelian RWL	280	560	270	2
Gouging Fire ex Temporal Forces	Fire	Blaze Blitz RRC	260	520	230	2
Darmanitan Twilight Masquerade	Fire	Inferno Onrush RRR	210	420	140	1
Infernape Twilight Masquerade	Fire	Scorching Fire RRC	200	400	140	1

One-hit Knock Outs without Weakness

Attacks with a printed 320+ damage.

Pokémon	Type	Attack	Damage	Damage to Decidueye ex	HP	Prizes
Mega Dragonite ex Ascended Heroes	Dragon	Ryuno Glide WLL	330	330	370	3

Best Prize trades

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

Pokémon	Type	Attack	Damage	Damage to Decidueye ex	HP	Prizes
Ceruledge Phantasmal Flames	Fire	Infernal Slash R	220	440	140	1
Centiskorch Temporal Forces	Fire	Charring Breath RR	180	360	140	1
Chandelure White Flare	Fire	Burn It All Up RR	180	360	150	1
Darmanitan Twilight Masquerade	Fire	Inferno Onrush RRR	210	420	140	1
Infernape Twilight Masquerade	Fire	Scorching Fire RRC	200	400	140	1
Ceruledge Surging Sparks	Fire	Black Blaze Slash RRC	160	320	140	1
Ethan's Typhlosion Destined Rivals	Fire	Steam Artillery RRC	160	320	170	1
Pyroar Prismatic Evolutions	Fire	Flame Tackle RRC	160	320	120	1

Pokémon that survive its biggest attack

These can take a printed 240 from Crushing Arrow and stay in play (Weakness included). Single-Prize Pokémon first.

Pokémon	Type	Stage	HP	Weakness	Retreat	Prizes
Wailord ex Pitch Black	Water	Stage 1	380	Lightning ×2	4	2
Palafin ex Prismatic Evolutions	Water	Stage 1	340	Lightning ×2	2	2
Slaking ex Surging Sparks	Colorless	Stage 2	340	Fighting ×2	4	2
Steven's Metagross ex Ascended Heroes	Metal	Stage 2	340	Fire ×2	3	2
Torterra ex Temporal Forces	Grass	Stage 2	340	Fire ×2	4	2
Hydrapple ex Prismatic Evolutions	Grass	Stage 2	330	Fire ×2	3	2
Salamence ex 30th Celebration	Dragon	Stage 2	330	None	2	2
Team Rocket's Nidoking ex Destined Rivals	Darkness	Stage 2	330	Fighting ×2	3	2

Every Standard Decidueye ex card

Card	Set	HP	Stage	Attacks (cost · damage)	Retreat	Weakness
Decidueye ex 12/88 Ability: Sniper's Eye	Perfect Order J	320	Stage 2	Crushing Arrow GCCC 240	2	Fire ×2

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).

Questions people ask

What is Decidueye ex weak to?

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

How much HP does Decidueye ex have?

Up to 320 HP in Standard.

How many Prize cards does Decidueye ex give up?

2 — it's a Pokémon ex.

What can one-hit KO Decidueye ex?

28 Standard cards can, going by printed damage. The fastest: Ceruledge's Infernal Slash (1 Energy, 440 damage); Blaziken ex's Smolder-sault (2 Energy, 400 damage); Centiskorch's Charring Breath (2 Energy, 360 damage).

What is Decidueye ex's strongest attack?

Crushing Arrow, which prints 240 damage for 4 Energy.

Pully Play is an independent fan guide. It isn't run by The Pokémon Company. Format facts are checked against official announcements; always confirm card legality with the official rules before a tournament.

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