Beedrill is awesome and I'll have to build a deck around him.
In Expanded, he would combo well with Virbank City Gym, no?
[G][G] Hazard Stinger: 40 damage. Discard all Energy attached to this Pokemon. Your opponent’s Active Pokemon is now Paralyzed and Poisoned. Between turns, place 4 damage counters on it instead of 1 for Poison.
40 base damage + 40 poison damage + 20 damage from Virbank City Gym = 100 damage in one turn from two energies.
Plus the opponent gets paralyzed, so unless the opponent has a way to switch/heal/evolve, you're looking at another 60 by the next turn.