Alright, so Squirts eventually goes down, and so does Gastly because the Ice Beam's direct hit happens to expose him. After all, a raging Wartortle is going to hit just about anything with a powerful ice attack.
BUT, the poison works VERY fast, and brings him down before he can finish the Gastly off. Gastly gets revenge-KO'd by the Golbat, which finds itself going up against an insane Shellder.
The battlefield is getting very hot right now, so both are going to get worn down fast, so this one will be a short round.