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I run it on Showdown with Unaware and Cosmic Power/Rest/Metronome/Stored Power.
You'll probably want to replace Metronome with a real move, but make sure you do, so Dark Types don't wall you. Equally, I guess you could stick Toxic on there and just pray you don't meet a Bisharp. If you're running Unaware, you'll want Rest over Moonlight, for Toxic.
I find Unaware more useful than Magic Guard. Most people are expecting Magic Guard, so they'll set up on me to try and match my Cosmic Powers, meaning I get even more time to boost to +4/+4 while they come out with a bunch of useless Dragon Dances.