Poliwrath

Description
This Water/Fighting type is adept at both the front crawl and breaststroke. Easily overtakes the best human swimmers.

Evolution
--Lvl 25--> ---->

Location
Evolve from Poliwhirl

You can also receive one in the pokemon center, section "Battle ready non-shiny pokemon."

Shiny Poliwrath
Evolve from shiny Poliwhirl