05. Ogerpon-Wellspring

Grass / Water · Water Absorb · A+ · 10.97% (2026-04) · 80 / 120 / 84 / 60 / 96 / 110 · The format’s defining one-slot breaker-pivot: a SD nuke that also U-turns, Encores, and Taunts, with a free Water immunity stapled on.

Set note: Ogerpon-Wellspring runs Water Absorb + Wellspring Mask (×1.2 to all its moves) — a fast Grass/Water SD breaker/pivot. Every set below assumes that.

Format role

Ogerpon-Wellspring is the metagame’s most over-represented “do-everything” offensive glue. Grass/Water is a defensively useful typing (4× resists Water, resists Ground and Steel, is neutral to Electric/Grass/Ice/Fire, and is weak to Flying/Poison/Bug with no 4× weakness), and Water Absorb is a hard switch-in to the format’s huge Water population (Urshifu-Rapid-Strike’s Surging Strikes, Slowking-Galar’s Scald sequences, rain, Manaphy; not Future Sight itself). Wellspring Mask makes Ivy Cudgel a 100-BP Water-typed STAB at effectively 120 BP, off a 120 base Attack, on a 110-Speed frame that outpaces most of the unboosted tier. That combination — a fast, immune-to-Water pivot that clicks Swords Dance and U-turn out of the same slot — is exactly the resilient, sequencing-friendly piece the metagame rewards. It anchors hyper-stack offense (as a fast breaker that also keeps momentum), bulky offense (as a Water-immune defensive pivot), and rain (Water Absorb + Grass STAB into opposing Waters). VR A+ and usage agree; the “most format-defining” tag in the tier table is earned by its flexibility, not by any single set being unbeatable.

Sets

The data is monotype on item and ability — Wellspring Mask 100%, Water Absorb 100% — and almost monotype on spread: Jolly 0/252/0/0/4/252 at 82.3%. Adamant variants (4.99% + 3.58%) trade the speed tier for power. Ivy Cudgel (99.96%) + Swords Dance (65.1%) is the spine; the other three slots are a menu.

Swords Dance breaker (the default — ~65% run SD)

Ogerpon-Wellspring @ Wellspring Mask
Ability: Water Absorb
Jolly Nature  (0 HP / 252 Atk / 4 SpD / 252 Spe)
- Ivy Cudgel        (99.96%)
- Swords Dance      (65.12%)
- Power Whip        (52.58%)  // or Horn Leech 24.73% for recovery
- Play Rough        (23.73%)  // or Knock Off 22.51% / Superpower 17.59%

Power Whip is the highest-usage coverage partner because Ivy Cudgel + Power Whip is dual-STAB that only gets walled by things resisting both Grass and Water (Dragonite, Mega-Venusaur, the rare bulky Grass). Play Rough is the anti-Dragon/Dark tech; Horn Leech (24.7%) swaps raw power for Giga-Drain-style recovery that lets it pivot in and out repeatedly.

Utility / pivot (U-turn 23.7%, Taunt 18.0%, Encore 13.1%)

Ogerpon-Wellspring @ Wellspring Mask
Ability: Water Absorb
Jolly Nature  (0 HP / 252 Atk / 4 SpD / 252 Spe)
- Ivy Cudgel        (99.96%)
- U-turn            (23.69%)
- Knock Off         (22.51%)  // or Power Whip
- Swords Dance / Encore / Taunt

The same chassis weaponized for momentum: U-turn keeps the pivot chain alive and scouts the switch-in; Encore (13.1%) turns a predicted defensive move (Recover, Wish, a setup turn) into free SD/U-turn; Taunt (18.0%) shuts off Alomomola/Toxapex/Gliscor recovery and hazard-setting leads. This is the build that makes Ogerpon-W “glue,” not just a breaker.

Adamant power variant (~8.6% combined)

Ogerpon-Wellspring @ Wellspring Mask
Ability: Water Absorb
Adamant Nature  (0 HP / 252 Atk / 4 Def-or-SpD / 252 Spe)
- Ivy Cudgel        (99.96%)
- Swords Dance      (65.12%)
- Power Whip        (52.58%)
- Superpower / Play Rough

Adamant (372 vs 339 Atk) is a deliberate choice on teams with their own speed control (Scarfer, screens, priority partner) that would rather guarantee the OHKO than win the base-110 mirror (Jolly 350 vs Adamant 319).

Legality note: there is no Tapunium-Z “Guardian of Alola” set here despite older notes — that Z-output requires Nature’s Madness, which Ogerpon-W cannot learn. Synthesis (5.8%) is the only other notable move.

What it does

The SD set is the textbook offense breaker: come in on a Water move or a forced switch (Water Absorb makes the former free), and the opponent has to commit. If they stay in with anything that doesn’t resist both STABs, you SD and the next hit OHKOs most of the tier. If they go to a check, you U-turn (different set) or Ivy Cudgel for chip and keep tempo. The 110 Speed tier is load-bearing: Jolly Ogerpon-W (350) outspeeds Jolly Garchomp (333), Lando-T (309), Tapu Lele (317), and the entire base-100-and-under field (max+ base-100 = 328), so it threatens to move first against most grounded breakers and revenge a huge chunk of weakened mons.

Encore + SD is the cleanest setup-manufacturing line in the format short of Slowking-Galar’s Future Sight chains: lock a Regenerator wall into Recover or a passive pivot into Wish/Teleport, then SD while that locked turn is low-risk. Taunt does the same job pre-emptively against stall and hazard leads. Horn Leech variants are the “annoying” build — they refuse to be chipped out because they heal back the U-turn/hazard damage, which is why they pair with screens or bulkier offense rather than pure HO.

The catch — and why it’s A+ rather than S — is that it is walled cleanly by a handful of common mons (below) and dies to faster Choice Scarf users and a wide priority field. It also can’t break what resists its STABs without the right fourth move loaded, and you only get one fourth move — a fast but frail, scoutable breaker.

Load-bearing calcs

Spreads: OW = Jolly 0/252/4/252 (339 Atk, 350 Spe), Wellspring Mask = ×1.2 on all moves. “+2” = post-Swords Dance.

• +2 Ivy Cudgel vs 252+ Def Zamazenta: 242-285 (62.4-73.5%) — even at +2, the premier check is not 2HKO’d from full, eats it, and Body-Presses back. This is the number that keeps Ogerpon-W honest.
• +2 Ivy Cudgel vs 252 HP / 0 Def Zamazenta: 328-388 (84.5-100.0%) — uninvested/offensive Zama is only a soft check; chip it once and +2 Ivy Cudgel rolls a clean OHKO into the late game.
• +2 Power Whip vs 252+ Def Alomomola: 736-871 (137.8-163.1%) [16/16 OHKO] — Grass STAB obliterates the #1 wall; even unboosted Power Whip is 369-439 (69.1-82.2%), a clean 2HKO. Alomomola does not wall the Power Whip set.
• +2 Power Whip vs 252+ Def Toxapex: 237-280 (78.0-92.1%) [2HKO] — Grass is only neutral on Poison/Water (Poison resists 0.5×, Water weak 2.0× = net 1.0×), so +2 Power Whip is a 2HKO, not an OHKO. Toxapex is a soft check to the Power Whip set: it survives a hit and has Regenerator + recovery to undo the chip, so you need prior damage (or to Taunt its recovery) to break it cleanly. The Ivy-Cudgel-only or Horn-Leech variants it walls outright — Ivy Cudgel into Pex is resisted, just 98-116 / 32.2-38.2% at +2.
• Play Rough vs full-HP Multiscale Dragonite: 116-138 (35.9-42.7%) — Multiscale walls the cold; you need ~25% prior chip (Stealth Rock + a turn) before Play Rough threatens. On a broken-Multiscale Dnite it’s 232-276 (71.8-85.4%).
• Horn Leech vs 0 HP Great Tusk: 223-261 (60.1-70.4%) — Grass STAB 2HKOs the spinner while healing ~30% back, the core reason Horn Leech variants pivot so freely.

Checks & counters

Hard counters (reliable switch-ins, from the block’s Checks & Counters):

• Zamazenta (64.3 / 80.1% — the #1 check) — bulky/defensive Body Press Zama eats +2 Ivy Cudgel (62-74% from full), isn’t 2HKO’d, and threatens the OHKO back. Watch for Superpower variants and prior chip (offensive Zama drops to +2 Ivy Cudgel near full), but the standard Zama reliably checks the standard set.
• Mega-Venusaur (63.2 / 84.6%) — Thick Fat is irrelevant here, but it resists both Grass and Water, shrugs off Play Rough, and Synthesis-stalls. The single best dedicated answer; one Mega-Venusaur covers Ogerpon-W, Urshifu, Tapu Koko, and Zamazenta in a slot (it sits in the tier table as the Thick-Fat Grass/Poison anchor).
• Dragonite (58.2 / 79.3%) — resists Grass and Water; Multiscale eats Play Rough at full HP (27-32%) and ExtremeSpeed/clicks back. Only loses if pre-chipped past Multiscale.

Soft checks / revenge:

• Gengar (51.0 / 82.3%) and other faster/equal-speed offense — anything outspeeding 350 or carrying priority (Mega-Scizor Bullet Punch, Dragonite ESpeed, Kingambit Sucker) revenges the frail 80/84 body.
• Choice Scarf base-110+ (525 Spe) and Zamazenta (412) outrun it; it has no priority and modest bulk, so it folds to a clean revenge once it’s committed to a move.
• The wrong fourth move is its own counter: an Ivy-Cudgel-only build is walled by Toxapex/Pecharunt; a no-Play-Rough build loses to Dragonite; a no-Taunt build is stalled by Gliscor/Alomomola. It can only solve one of these per game.

★ Offense angle

This is one of the cleanest single-slot offense pieces in the format, and you should usually run it as a fast SD breaker + emergency Water-immune pivot, not as a defensive piece.

• Pivot-and-punish core. Pair it with a slow pivot - Slowking-Galar (Future Sight + Chilly Reception) or Landorus-Therian U-turn - so Ogerpon-W comes in safely on the wall the FS is about to hit. FS chip + +2 Ivy Cudgel/Power Whip breaks targets neither could solo, and U-turn keeps the chain alive when it draws its check.
• Lead/hazard synergy. Its Power Whip blows the lid off the #1 Regenerator wall at +2 (Alomomola 138-163%, a clean OHKO) and 2HKOs the second (Toxapex 78-92%), so it is the breaker that makes hazard-stack offense pay off: stack Spikes/Rock with Gholdengo denying removal, then Ogerpon-W deletes the fish — and chips Toxapex past the point Regenerator can save it — so the opponent loses the sponges they lean on to absorb everything else. (Pex survives one +2 Power Whip from full, so prior hazard chip or a Taunt on its recovery is what turns the 2HKO into a kill.)
• Encore manufactures setup. Against passive balance, Encore a Recover/Wish/Teleport and SD on the locked turn - the single most reliable way for offense to create a setup turn against bulky cores without spending a teammate.
• Speed math you exploit. 350 means it leads the unboosted ground game (Garchomp 333, Lando-T 309, Lele 317); your job is to keep it healthy for the late game where +2 cleans, and to pre-load the answer to its counter — Play Rough for Dragonite, Knock Off + chip for Mega-Venusaur, Superpower for Kingambit/Ting-Lu.
• When it’s on the other side: keep your Zamazenta or Mega-Venusaur unchipped (they wall it only near full HP — a chipped Zama eats +2 Ivy Cudgel), respect Water Absorb (never click a Water move into it for free), and revenge with a base-110+ Scarfer (525) or priority — it has none and a frail 80/84 body. Don’t let it Encore your wall — click the attacking move, not the recovery, on the turn it threatens to come in.

Top teammates & cores

From Ogerpon-Wellspring’s 2026-04 Teammates block (top-5): Landorus-Therian 24.2% · Gholdengo 19.3% · Great Tusk 16.5% · Alomomola 16.4% · Zapdos 15.0%. (Directional core figures below — e.g. Diancie-Mega ~30%, Kingambit ~29% — are that partner’s share of Ogerpon teams, not Ogerpon’s share of theirs.)

• Ogerpon-W + Landorus-Therian (24.2%) + Gholdengo (19.3%) — the hazard-stack offense core. Lando-T sets Stealth Rock and slow-U-turns Ogerpon-W in safely; Gholdengo denies the opponent’s spin/Defog so the chip sticks; Ogerpon-W then breaks the now-unrecoverable Regenerator walls. This is the structure its STABs are built to finish.
• Ogerpon-W + Diancie-Mega (a strong mutual offense pair; Diancie lists Ogerpon-W at 39.2%). Magic Bounce deters conventional status hazards and bounces back rocks that would otherwise chip the frail breaker, while Diancie’s mixed coverage handles the Dragons/Flyings (Dragonite) that wall Ogerpon-W. Note the single-Mega-slot cost: Diancie-Mega competes with Mega-Scizor’s priority, so commit to one.
• Ogerpon-W + Kingambit (29.0%) / Dragonite (17.3%) — the priority backstop. Kingambit Sucker/ESpeed-class priority and Dragonite ExtremeSpeed clean up the faster offense and Scarfers that revenge Ogerpon-W, while Ogerpon-W’s Water immunity covers their shared Water weaknesses. Zamazenta (29.3%) appears as the all-purpose offensive glue that also happens to hard-check the opposing Ogerpon-W in the mirror.