Even though you haven't beat the story and therefore don't have many recruitment and evolution options, I can still see some improvements that can be made. Bulbasaur should have Razor Leaf instead of Vine Whip and Secret Power instead of Tackle. Poison Powder is not that good either; I'd have Sleep Powder instead
Charmander has a worthwhile moveset, not much you can improve there until you beat the story, evolve to Charizard, and "relearn" Heat Wave. Though you should level up Charmander as quick as possible and have it learn Flamethrower