Pikachu315111
Ranting & Raving!
I think we should start edging on the side of caution, we're almost wishlisting (not quite yet, but I can see it devolving into it). Like as of now I think the only direction we can go is just listing the Pokemon who's stats could swing it in one direction or another.So where's Mega Pikachu? </sarcasm>
In all seriousness, the only Double Mega candidates I feel that are "logical" are those Pokemon that are already a mixed stat mon.
So if a Mon has the potential for both sides of the damage spectrum, it is likely to get a double mega. Infernape can (and I sorta hope it does) have two megas as proven by the fact it is the single most versatile starter Pokemon ever created.
Speaking of which, Raichu would be on the list. The very least Pikachu's popularity can do for its poor, overlooked evolution is let it have two Mega Evolutions.