Some of the best files on this site are totally custom characters that just take the places of some characters. One of my favorites is Project Mewtwo (http://forums.kc-mm.com/index.php?topic=55338.0), but it overwrites one of my favorite characters, Lucario.

There are older versions of the hack ported to other characters, but I was looking to learn to do it myself.

If anyone knows how to do this or can point me in the right direction, that'd be great!