User blog comment:Florence100 the Sylveon/AI controlled Chespin preforming specials?/@comment-3495717-20130804151831

Though it depends on whether you want Chespin to be compatible with WinMUGEN or not, I'd take a look at this tutorial.

If you want it to be compatible with WinMUGEN, use the second half of the tutorial. If you don't mind about compatibility, use the first half.