Suggested by Sonic Squirtle is one of the original water Pokemon and yet he still ranks up there as one of the strongest ones. He is quick and has a good combo game as well as a ton of moves at his disposal. This means that Isabelle is basically out of luck when going up against him because she can’t keep up with his moves. Squirtle is basically invincible as far as she is concerned. He won’t even need to evolve to win this fight. Squirtle wins.