Using Binary Editor / Exe Checking

[DannyB01]

Hi, I've been using the legality checker for quite a while know and know exactly what i'm doing with it (well near enough anyway ). However I've recently heard talk of binary editors being useful for checking, as well as exe checking being useful for checking event pokemon. I'm not thinking about using these to make my own pokemon, just check if ones i've received are legal. Any help I could get on this would be hugely appreciated. Thanks for your time (sorry if this is in the wrong section).