If there is any game I think deserves a remake, it is Mother 1. A lot you can do with that game
Giygas would be a welcome out of left field choice and it would be interesting to see a more fleshed out design of what he looked like in Mother 1. There still doesn't feel like we have many villains and I think Nintendo has a pretty interesting pantheon of villains..
are really the only ones we have (I don't really count
, they are more anti heroes) I think Giygas, Porky, Darkmatter, Skull Kid, Medusa, Black Shadow, Andross (idk they could find a way), and Team Rocket (vounterpart to PK Trainer, would have Meowth, Arbok, and Victreebel) would all make some interesting additions.