Hmm...this will be tricky. Golett, use Rock Slide, then Toxic Embirch. The Rock Slide will knock it down to low enough to be finished by poison. Machop, you're kinda boned. However, you are now faster than Gastly and Drilbur, so you can safely Ice Punch Drilbur. If you somehow have a second action, then use Bullet Punch Gastly. Tepig, you can also enjoy a boost in speed from TR. However, we need to wait while your SpA comes back up. In the meantime, use Flame Charge Drilbur (even if it is counter-productive) and since Drilbur won't be available to hit A2, use Yawn Gastly.