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How to beat Cornerstone Mask Ogerpon ex

Cornerstone Mask Ogerpon ex has 1 version in the 2026–27 Standard format, with up to 210 HP as a Fighting Pokémon. Here's the maths for Knocking it Out — worked out from every Standard-legal card.

HP: 210

Weakness: Grass

Resistance: None

Prizes: 2

One-hit KOs: 108

Fastest KO: 1 Energy

Game plan

Hit its Weakness. Cornerstone Mask Ogerpon ex is weak to Grass, so those attacks do double damage. 40 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. 52 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 Demolish for 140 (3 Energy). 351 Standard cards have enough HP to survive one hit — before any Weakness, + or × effects.
Watch the Retreat Cost. It costs 1 Energy to retreat. If it gets stuck in the Active Spot, that's your chance.

One-hit Knock Outs using Weakness

These Grass attacks do at least 210 after Weakness. Fastest (fewest Energy) first.

Pokémon	Type	Attack	Damage	Damage to Cornerstone Mask Ogerpon ex	HP	Prizes
Decidueye Shrouded Fable	Grass	Power Shot G	170	340	150	1
Lurantis Destined Rivals	Grass	Petal Blade Dance G	130	260	120	1
Beedrill ex Chaos Rising	Grass	Rumbling Bees G	110×	220	310	2
Rillaboom Twilight Masquerade	Grass	Wood Hammer GG	180	360	180	1
Shiftry Temporal Forces	Grass	Energy Loop CC	140	280	150	1
Lurantis ex Pitch Black	Grass	Leaf Guard GC	140	280	260	2
Scovillain ex Temporal Forces	Grass	Two-Headed Crushing GG	140	280	260	2
Breloom Temporal Forces	Grass	Knuckle Impact GC	120	240	120	1
Ludicolo Phantasmal Flames	Grass	Lunge Out GC	120	240	160	1
Sinistcha ex Twilight Masquerade	Grass	Matcha Splash GC	120	240	240	2
Leafeon ex Prismatic Evolutions	Grass	Moss Agate GRW	230	460	270	2
Iron Leaves ex Prismatic Evolutions	Grass	Prism Edge GGC	180	360	220	2

One-hit Knock Outs without Weakness

Attacks with a printed 210+ damage.

Pokémon	Type	Attack	Damage	Damage to Cornerstone Mask Ogerpon ex	HP	Prizes
Palafin ex Prismatic Evolutions	Water	Giga Impact W	250	250	340	2
Tinkaton Mega Evolution	Metal	Windup Swing M	240-	240	160	1
Ceruledge Phantasmal Flames	Fire	Infernal Slash R	220	220	140	1
Slaking ex Surging Sparks	Colorless	Great Swing CC	280	280	340	2
Mega Lucario ex Ascended Heroes	Fighting	Mega Brave FF	270	270	340	3
Vikavolt Pitch Black	Lightning	Giga Railgun LL	260	260	160	1
Cynthia's Garchomp ex Ascended Heroes	Fighting	Draconic Buster FF	260	260	330	2
Luxray ex Twilight Masquerade	Lightning	Volt Strike LL	250	250	310	2
Salamence ex 30th Celebration	Dragon	Dragon Pulse RW	240	240	330	2
Haxorus Shrouded Fable	Dragon	Dragon Pulse FM	230	230	170	1

Best Prize trades

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

Pokémon	Type	Attack	Damage	Damage to Cornerstone Mask Ogerpon ex	HP	Prizes
Decidueye Shrouded Fable	Grass	Power Shot G	170	340	150	1
Lurantis Destined Rivals	Grass	Petal Blade Dance G	130	260	120	1
Tinkaton Mega Evolution	Metal	Windup Swing M	240-	240	160	1
Ceruledge Phantasmal Flames	Fire	Infernal Slash R	220	220	140	1
Rillaboom Twilight Masquerade	Grass	Wood Hammer GG	180	360	180	1
Shiftry Temporal Forces	Grass	Energy Loop CC	140	280	150	1
Vikavolt Pitch Black	Lightning	Giga Railgun LL	260	260	160	1
Breloom Temporal Forces	Grass	Knuckle Impact GC	120	240	120	1

Pokémon that survive its biggest attack

These can take a printed 140 from Demolish and stay in play (Weakness included). Single-Prize Pokémon first.

Pokémon	Type	Stage	HP	Weakness	Retreat	Prizes
Wailord Journey Together	Water	Stage 1	240	Lightning ×2	4	1
Copperajah Shrouded Fable	Metal	Stage 1	200	Fire ×2	4	1
Rhyperior Stellar Crown	Fighting	Stage 2	200	Grass ×2	4	1
Steelix Mega Evolution	Metal	Stage 1	200	Fire ×2	4	1
Copperajah Journey Together	Metal	Stage 1	190	Fire ×2	4	1
Tyranitar Journey Together	Darkness	Stage 2	190	Grass ×2	3	1
Aggron Twilight Masquerade	Metal	Stage 2	180	Fire ×2	3	1
Archaludon Phantasmal Flames	Metal	Stage 1	180	Fire ×2	2	1

Every Standard Cornerstone Mask Ogerpon ex card

Card	Set	HP	Stage	Attacks (cost · damage)	Retreat	Weakness
Cornerstone Mask Ogerpon ex 58/131 Ability: Cornerstone Stance	Prismatic Evolutions H	210	Basic	Demolish FCC 140	1	Grass ×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 Cornerstone Mask Ogerpon ex weak to?

Cornerstone Mask Ogerpon ex is weak to Grass, so those attacks do double damage (×2).

How much HP does Cornerstone Mask Ogerpon ex have?

Up to 210 HP in Standard.

How many Prize cards does Cornerstone Mask Ogerpon ex give up?

2 — it's a Pokémon ex.

What can one-hit KO Cornerstone Mask Ogerpon ex?

108 Standard cards can, going by printed damage. The fastest: Decidueye's Power Shot (1 Energy, 340 damage); Lurantis's Petal Blade Dance (1 Energy, 260 damage); Palafin ex's Giga Impact (1 Energy, 250 damage).

What is Cornerstone Mask Ogerpon ex's strongest attack?

Demolish, which prints 140 damage for 3 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.

Data checked 13 October 2026 · How we build our guides

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