(pardon my newbiness, lol)
Is this the same legality checker as the Legal.exe used by Pokecheck for generation 4? I put a bunch of Pokewalker pokemon up on Pokecheck, and they read as hacked or unknown. (Sorry if this is already known )
Here's an example pokemon: http://pokecheck.kraftpaper.org/?p=detail&uid=170445
Here's the whole box of pokemon: http://pokecheck.kraftpaper.org/?p=box&bid=4&u=slowbro