Grass-type Four Mask Forms Tera Guide

Ogerpon
VGC Guide

Ogerpon’s additional type and ability change with each mask form, and Ivy Cudgel’s type matches the equipped mask. Upon Terastallization, Ogerpon’s type fully becomes the mask’s type, granting Ivy Cudgel a STAB boost and significantly increasing damage. With 120 base Attack and 110 base Speed, it is a fast, high-burst physical attacker.

Four Mask Forms Comparison

Ivy Cudgel — Signature Move

Ivy Cudgel has 100 base power and matches the equipped mask’s type, gaining STAB after Terastallization. Post-Tera Ivy Cudgel effective power: 100 × 1.5 STAB = 150 BP. Combined with Ogerpon’s 120 Attack, this deals massive damage against the vast majority of targets.

Hearthflame Mask — Mold Breaker
Type: Grass/Fire. Mold Breaker ignores abilities (e.g., Levitate’s Ground immunity). Sun boosts Fire-type Ivy Cudgel further.
Wellspring Mask — Water Absorb
Type: Grass/Water. Water Absorb immunizes Ogerpon to Water moves and heals HP — Kyogre teammates cannot accidentally hit it. Rain boosts Water Ivy Cudgel further.
Cornerstone Mask — Sturdy
Type: Grass/Rock. Sturdy prevents OHKO from full HP, guaranteeing at least one action. Rock Ivy Cudgel covers Flying and Fire-types well.
Teal Mask — Embody Aspect (Speed)
Type: pure Grass. Speed +1 on entry raises Ogerpon’s Speed to 165 effective — nearly guarantees moving first. Pure Grass has fewer weaknesses.

EV Spreads

Hearthflame Offensive
Jolly
252 Atk / 4 SpDef / 252 Spe
Jolly maximizes Speed; Life Orb boosts all moves. Hearthflame Mold Breaker ignores Levitate and other ability-based protections. Sun-boosted Fire Ivy Cudgel is nearly unresistable.
Item: Life Orb
Wellspring Bulky
Bold
252 HP / 252 Def / 4 SpDef
Water Absorb immunizes Ogerpon to Kyogre’s Water Spout. Bold bolsters physical bulk for multi-turn survival. Sitrus Berry auto-heals — the most durable Ogerpon form in rain teams.
Item: Sitrus Berry
Teal Mask Speedy
Jolly
252 Atk / 4 HP / 252 Spe
Embody Aspect boosts Speed +1 on entry. Focus Sash guarantees at least one action against OHKO threats. Teal Ivy Cudgel (Grass) hits Dondozo, Kyogre, and Swampert for super-effective damage.
Item: Focus Sash

Team Partners

Koraidon (Hearthflame Partner)
Sun Boosts Fire Ivy Cudgel

Koraidon’s Orichalcum Pulse sets Sun, boosting Hearthflame Ogerpon’s Fire Ivy Cudgel by ×1.5. Koraidon is Fire-immune, eliminating friendly fire risk. This is a high-usage sun dual-core in VGC.

Kyogre (Wellspring Partner)
Rain + Water Absorb Synergy

Wellspring Ogerpon’s Water Absorb immunizes it to Kyogre’s Water Spout. Both form the rain team’s front duo — Kyogre handles special Water output while Ogerpon provides physical and Grass coverage.

Incineroar
Fake Out Entry Support

Fake Out enables safe Ogerpon entry before Terastallization. Parting Shot reduces opposing SpAtk, protecting Ogerpon’s 96 SpDef. This support applies to all four Ogerpon mask forms.

Tornadus
Tailwind Speed Amplifier

Tailwind brings Ogerpon’s 110 Speed to 220. With Teal Mask Embody Aspect on top, it acts before virtually everything. Prankster Taunt prevents opponents from using field moves against Ogerpon.

How to Counter Ogerpon

Hearthflame Weaknesses: Rock ×2, Poison ×2, Flying ×2

Hearthflame Mask (Grass/Fire) is weak to Rock, Poison, and Flying. Rock Slide or Landorus-Therian’s Rock coverage deals heavy super-effective damage, especially in sun team matchups where Hearthflame is most common.

Wellspring Weaknesses: Electric ×2, Grass ×2, Poison ×2

Wellspring Mask (Grass/Water) is weak to Electric, Grass, and Poison. Miraidon’s Electro Drift or Rillaboom’s Grassy Glide can pressure Wellspring Ogerpon effectively.

KO Before Terastallization

Ogerpon must spend a turn to Terastallize. Outspeeding and eliminating Ogerpon before it Teras prevents Ivy Cudgel from gaining STAB. Speed control is the most effective counter direction.

Steel-types Resist Grass Coverage

Ivy Cudgel’s Grass type is resisted by all Steel-types (0.5×). Steel-type partners or opposing Pokémon like Gholdengo or Corviknight can safely tank Teal and Wellspring Ogerpon’s Ivy Cudgel.

Related Guides & Tools
Sun Team Guide
Best team for Hearthflame Mask
Kyogre VGC Guide
Best partner for Wellspring Mask
VGC Item Guide
Life Orb vs Focus Sash decision