This Gym, as you might suspect, is brimming with Electric-Type Pokémon. That means, bring as many Rock and Ground types that you can muster. If you've been working on raising a Torchic, bring that too... because by now it should be a Combusken who knows Double Kick, which can be quite devastating here. A Geodude with Magnitude will also be quite a hit. Leave your birds and fish at home, though.