Originally Posted by Fat Chenkovsky
The hack tests at VGC are somewhat more rigorous than those of GBU, so I wouldn't take that risk as something as obvious as a pokemon with a ability illegal for the gender probably wouldn't pass...
actually IIRC most things that pass the GBU test are legal at VGC. Pokecheck also has an identical hackchecker on their site here: http://www.pokecheck.org/?p=toolbox
(although you need an account and a way to upload the Pokemon, which shouldn't be that hard...)