Jigglypuff should be able to hit other characters physically except Banette unless it uses the "ice-beam" speacial move, corresponding to Banette uses regular physical attacks unless it uses its special ghost-moves it shoudn't effect jigglypuff(even though it hits but dos'nt do or little damage), but mainly Ghosteo pokemon characters are coded only to each other and not made to be going against other different characters since they were made for his game only. Though "Mugen standard wise", these characters will need to be fixed in referring to the basic state "common1.cns" in order for them to work normally in mugen.
Yes I know about that already. Some of the stages I have already in the mediafire folder "pokemon stages made be Seth Lee":
https://www.mediafire.com/folder/zemx670xu7gs2/pokemon_stages#hvpb60y5236tb
But Thanks Though.