How do I defeat Crasher Wake in Pokemon Platinum?

First off, you wanted an evenly stacked team. Your team's levels range from 20-46, and only three of them from what your saying are really capable of fighting in this gym. Take some time away from the gym and train your Pichu, its electric moves should be devastating against Wake and the rest of his pokemon. Train your Eevee and evolve it into a Jolteon if you need extra muscle.