My weaknesses are everyone elses' go-to tricks on flat. Any spinning nollie fliptrick, nollie bs bigspin, full cab, fs flip, tre, fakie tre. I've got two friends that will shut me out every time if they don't fuck up based on their knowledge of what I just can't do.
But like I SUCK said, it's all about heelflips. Maybe all ollie-north variations, or double-flips. the kookier the better if you're playing someone that's actually good, and don't want it to go into infinity