Use get an electric Pokemon in your team, like Manectric, it will help you beat Wallace. And if you can, grab the Dragon Claw TM from Meteor Falls and you can use that to beat Kingdra (But it's really a waste of the TM, I'd use that as a last-ditch effort). And evolve Grovyle!! It's stats will grow so much, plus there really isn't any extra move you need to wait for to evolve.