This deck is based around Koga's Beedrill and it's supporting synergy cards like Koga's Ninja Trick and Fuchsia City Gym.
Ramping up to Beedrill quickly is easy thanks to Koga's Kakuna's Pokemon Power Emerge, and you can use Koga's Ninja Trick to force your opponent to attack Koga's Muk and potentially get energy drained. Even if you can't attack with Sludge Whirlpool, Muk makes a great painful roadblock to deal with, and you can use Fuchsia City Gym to deny your opponent a prize card if he starts getting toward low health.