Mawile

I'm not sure how you can make Crobat fit both roles as a staller support or a full out attacker. Toxic with Crobat will hit 100% and through substitutes. Toxic, Taunt, Defog/roost, and super fang? There's a lot of options to set up for him, that's for sure.
If going as an attacker, Crobat can also work pretty well with a Nasty Plot set, if you can breed that onto him. His movepool for special attacks seems to be a bit better and have a bit more coverage. He can learn giga drain as an egg move, and heat wave from a generation 5 move tutor. Being extremely fast, you can get lucky with the flinch hax from air slash. And in rain, you can also abuse 100% hurricane... just too bad Crobat can't learn it.

[COLOR="#008080"]Well, I could try to do that...mayyybe. I'm still deciding between Crobat and Gyrados. Bulky Gyrados is still pretty decent when I'm not running a Mega Gyrados...I'm leaning towards Gyrados atm but I'll think about it after I breed Mawile and Salamence (since those two seem to go together like PB&J).

A SpA'er Crobat? That was unexpected....because cross poison seems to be great for fairies (I had a few online matches where my non-IV Crobat killed a lot of fairy or grass types) and Brave Bird (with Black sludge) gives him a good revenge kill and runs away with U-Turn (if the person doesn't have a priority move). I think a SpA-focus Crobat will get people off guard but the set I have atm (Brave Bird/U-Turn/Roost/Cross Poison) makes him for a decent attacker. Then again, I'm not very knowledgeable with the SpA-focused Crobat. [/COLOR]