I recommend adding Gastrodon somewhere. If you have a thunder spammer, it could be the deciding factor of who wins.
Hmm, maybe I will take out Gyarados, switch Dragonite to a Physical set, and add Gastrodon in.
That would be wise. The only thing you'd have to worry about is Bullet Seed Technician Breloom, or the occasional Swampert. However, your other pokes could take care of that. I've faced these things many times and the only way I can kill them is by burning them and stalling them.
**** you SE for trolling us with that TWEWY port. I hate you.