Ya know, if Mawile gets an evo, there is only one thing I hope it gets: Fake Out.
Everyone who has played VGC at least once knows how good Fake Out + Intimidate is. Not only that, but a steel typing would give it a lot of switch-ins, and with Icy Wind on it's arsenal, it'd be a really good VGC supporter.
Now, if it were to get Snarl as well, I wouldn't even doubt using it.