"This carefree Pokémon has an easy-going nature. While swimming, it always bumps into boat hulls."
There are some Pokemon in the world that just don't mind going with the flow. For the Johto region, that Pokemon is Quagsire. While Wooper is often seen as very upbeat, Quagsire is very laid back, it's sometimes known to not respond to things in a timely matter, and as the Pokedex entry above notes, it's not afraid to see where the current takes him...even if that leads to an impact.
Quagsire's Basic Attacks are Water Gun and Mud Shot, its Special Attacks are Stone Edge, Sludge Bomb and Earthquake.