Bulky Starmie could be a nice partner, however it does amplify your electric weakness. As long as your team has something else, or probably two other things, to handle Thundurus, such as AV Raikou + Hippo, you should be good.What would you pair with this bad boy? I feel like Bulky Starmie (with Reflect Type and the 224 Speed/rest HP/Def and Scald/Recover/RS) would be a great partner assuming you run Aerial Ace in your last slot since it covers your water weakness.