Mid-stage Pokemon like Poliwhirl rarely see competitive play outside of special formats. It's a waypoint on the road to Poliwrath, which is where the real potential kicks in. An original Gen 1 pick. Sits at a decent but contested Speed tier.
Speed and HP carry most of Poliwhirl's stat budget. Sp. Atk's the obvious dump stat. Common in the wild and yields 2 Speed EVs. Follows a 1.06M XP medium-slow curve.
Under attack, it uses its belly spiral to put the foe to sleep. It then makes its escape.
Poliwhirl Weakness
GoodElectric and Grass-type moves hit Poliwhirl for super-effective damage. 4 resistances help offset the weaknesses. Water Absorb grants an additional Water immunity, reshaping the matchup chart.
From here, Poliwhirl's line branches into Poliwrath and Politoed. That's 2 possible evolutions, each with its own method. So far, HP got the biggest boost (+25 from Poliwag). The final form adds another 125 stats on top.
How to Evolve
Breed with Poliwhirl to get Poliwag eggs easily from the Water1 egg group.
Best Build
Let's Go Pikachu & Eevee uses different battle mechanics.
Competitive build content is not applicable for this game. Select a main series game for builds.
Leveling does the heavy lifting. Poliwhirl picks up Hydro Pump and Blizzard along the way, building toward a complete offensive set. TMs add Normal and Fighting coverage and more, but the foundation's already strong by then.
Level-Up Moves
TM Moves
Egg Moves
Tutor Moves
10 encounter spots for Poliwhirl at moderate rates starting from early-game water routes. Best and Earliest sort options below help narrow down your approach based on odds vs. Accessibility.
Where To Catch Poliwhirl in Let's Go Pikachu & Eevee
To get Poliwhirl, start by catching Poliwag through surfing encounters at Lv. 3-56. The chain covers 2 catchable stages before reaching the final form.
Step 1Catch PoliwagEASYRoute 22Let's Go PikachuSurfing on waterLv.3-445%EarlyRouteEASYRoute 22Let's Go EeveeSurfing on waterLv.3-445%EarlyRouteEASYRoute 25Let's Go PikachuSurfing on waterLv.9-1445%EarlyRouteEASYRoute 25Let's Go EeveeSurfing on waterLv.9-1445%EarlyRouteEASYRoute 23Let's Go PikachuSurfing on waterLv.41-4645%LateRouteEASYRoute 23Let's Go EeveeSurfing on waterLv.41-4645%LateRouteEASYCerulean Cave - 1FLet's Go EeveeSurfing on waterLv.51-5645%PostCaveEASYCerulean Cave - 1FLet's Go PikachuSurfing on waterLv.51-5645%PostCaveEASYCerulean Cave - B1FLet's Go EeveeSurfing on waterLv.51-5645%PostCaveEASYCerulean Cave - B1FLet's Go PikachuSurfing on waterLv.51-5645%PostCave
Step 2Poliwhirl ✓CHALLENGINGRoute 22Let's Go PikachuSurfing on waterLv.3-410%EarlyRouteCHALLENGINGRoute 22Let's Go EeveeSurfing on waterLv.3-410%EarlyRouteCHALLENGINGRoute 25Let's Go PikachuSurfing on waterLv.9-1410%EarlyRouteCHALLENGINGRoute 25Let's Go EeveeSurfing on waterLv.9-1410%EarlyRouteCHALLENGINGRoute 23Let's Go PikachuSurfing on waterLv.41-4610%LateRouteCHALLENGINGRoute 23Let's Go EeveeSurfing on waterLv.41-4610%LateRouteCHALLENGINGCerulean Cave - 1FLet's Go EeveeSurfing on waterLv.51-569%PostCaveCHALLENGINGCerulean Cave - 1FLet's Go PikachuSurfing on waterLv.51-569%PostCaveCHALLENGINGCerulean Cave - B1FLet's Go EeveeSurfing on waterLv.51-569%PostCaveCHALLENGINGCerulean Cave - B1FLet's Go PikachuSurfing on waterLv.51-569%PostCaveor evolve from Poliwag (Step 1)
Poliwhirl is meant to evolve into Poliwrath. At 385 BST, the stats aren't there for competitive play yet. Pre-evolution Pokemon rarely hold up against fully evolved threats.
Swift Swim is what you want on Poliwhirl. Every competitive set worth running is built with that ability in mind. The alternatives (Water Absorb, Damp) work on paper but Swift Swim is what makes Poliwhirl worth using.
Base 90 Speed is workable — faster than some, slower than many. On offense, Poliwhirl is a mixed attacker — base 65 Attack and 50 Sp. Atk.
Poliwhirl appears in 20 games, including Yellow, Red & Blue, and Gold & Silver.
One of the original 151, Poliwhirl has appeared in 20 games — nearly every mainline game. From Red & Blue through the latest titles, it's rarely been left out of a regional Pokedex.
- Gen IY
Yellow - Gen IRBDebut

Red & Blue - Gen IIGS

Gold & Silver - Gen IIC
Crystal - Gen IIIRS

Ruby & Sapphire - Gen IIIFRLG

FireRed & LeafGreen - Gen IIIE
Emerald - Gen IVPt
Platinum - Gen IVHGSS

HeartGold & SoulSilver - Gen IVDP

Diamond & Pearl - Gen VBW

Black & White - Gen VB2W2

Black 2 & White 2 - Gen VIXY

X & Y - Gen VIORAS

Omega Ruby & Alpha Sapphire - Gen VIIUSUM

Ultra Sun & Ultra Moon - Gen VIISM

Sun & Moon - Gen VIILGPE

Let's Go Pikachu & Eevee - Gen VIIISwSh

Sword & Shield - Gen VIIIPLA
Legends: Arceus - Gen VIIIBDSP

Brilliant Diamond & Shining Pearl - Gen IXSV

Scarlet & Violet - Gen IXLZA
Legends: Z-A