I'm kind of a noob when it comes to battling, but I've been having success with weaknite on Wifi and Showdown.
Dragonite @ Weakness Policy
Ability: Multiscale
252 Atk / 252 Spe / 4 HP
Adamant
- Dragon Dance
- Dragon Claw
- Roost
- Earthquake
Get a safe switch-in, Dance, Roost off the damage, and hit stuff. Roost for keeping Multiscale intact obviously, I've yet to be OHKO'd yet, so weakness policy almost always activated. It's really easy to sweep with a +3 Attack, +1 Speed Dnite. I think only one unboosted Poke out speeds it at +1, could be wrong though. I focus on keeping HP full, just so I can tank hits. I know it can't touch Togekiss, but that's what Mega Scizor is for