Rain's vote:
Use a poison gas on Blastoise
+Typhlosion
-Blastoise
EDIT: I'm sure Rain bought a deluxe poison pack, but it isn't in his inventory. Can you not buy more than one item per round too? (I know you can only use one type of items). If he hasn't bought a deluxe poison pack, nevermind the poison gas from this vote.
My vote
+Typhlosion
-Blastoise