Back in the day, there was a bug that made Ghost attacks ineffectual on Psychic types. Also, Special Attack and Special Defense were all one stat, and critical hits depended on your speed.
Who would win, Mewtwo from back in those times, or Arceus?
notes: Arceus cannot use Steel or Dark plates, to keep it from causing issues as those weren't around in R/B/Y. Mewtwo does have access to Psystrike and Aura Sphere, though. Arceus can use any other of the plates.
Please explain who would win, and why? Thanks!