I've used Corphish in Pokémon Ruby once, but I have never really evolved it. Design-wise, Corphish is not so bad. It's quite a tough little fellow, and it's always ready to help you whenever you call it out on the field. When it comes to battling, this isn't such a bad Pokémon either. It's got only one type (and not two), which keeps the amount of its weaknesses at a minimum. It has great Attack power, which allows it to take nearly any Pokémon that are as equal to its size. Plus, it contains a variety of moves in its arsenal that it can take good advantage of, such as Swords Dance, Brick Break, Aerial Ace, Crabhammer, Waterfall, and Double-edge.