Squirtle

Squirtle comes into the fifth generation as a Pokemon that has been mostly left behind, being overshadowed by the many other Water-types in Little Cup. However, not all is bad for Squirtle, as it does have a few niches to fill. It is one of two Pokemon in the tier that has access to Fake Out and Aqua Jet, making it a good priority user. The only other Pokemon that has access to these two moves, Seel, has a much smaller movepool to work with, meaning Squirtle does this a bit better. Squirtle also learns Rapid Spin, and can take hits on both sides, unlike other Water-types who learn Rapid Spin, such as Tentacool and Shellder. Lastly, Squirtle is one of only a few Pokemon to learn Water Spout, and unlike Frillish, it is not weak to Pursuit. As long as you take advantage of what it has over other Water-types, Squirtle can be a useful member of a Little Cup team.