(19) Onett (Melee/Brawl) vs. (29) Brinstar Depths (Melee) (32) Fourside (Melee) vs. (46) Pokemon Stadium 2 (Brawl)
Onett is fine, but never really struck me as one of the better levels and the cars can be very annoying.
I don't think I like Pokemon Stadium 2 as much as the original, some of the stage transformations are kind of annoying, although I do like the wind one. Fourside really doesn't stand out to me as that memorable or great, I think it got pretty lucky draws in the tournament, but I still think in this head to head matchup it's deserving.
Could we see an all Earthbound battle in the Elite Eight? Would be interesting.