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Leavanny is great for attack, but pretty frail and with some crippling weaknesses.
Scolipede is a fast, bulky motherfucker. Not packing too much punch, but reliable.
Galvantula's really frail, but CompoundEyes and Thunder shits on EVERYTHING, and its fast too
Accelgor is more for competitive play. It's the fastest thing in the game with some great support moves, but dies against everything.
Escavalier pretty much won't die unless you pit it against a fire type. Amazing bulk and attack, but really slow.
Durant comes along pretty late game, but is essentially a faster, less powerful Escavalier. Really useful and easy to use if you can stomach the wait.
Cruste's a really awesome typing that covers bugs main weaknesses. Like Escavalier, it's bulky but slow.
Volcarona is an absolute MONSTER, but getting one takes a lot of work.
Any one of them performs extremely well through the game. The only one that struggles a bit is Accelgor, since in-game is a slugfest.