Tentacool

Tentacool's great Special Defense and decent Speed along with a good movepool allow it to be a decent entry hazard remover. It also has a good defensive typing, resisting common types like Fighting and Fairy. It doesn't have a slacking offensive movepool, either, with access to Sludge Bomb, Knock Off, and Scald. However, its actual attacking stats are lackluster, as is its physical bulk. Its longevity isn't helped by the fact that it doesn't have any reliable recovery outside Berry Juice, and it faces competition from other Water- / Poison-types like Skrelp and Mareanie. Nevertheless, Tentacool sets itself apart from these Pokemon by having access to Rapid Spin and a better Speed stat.