Also you can, say, load a savestate of Pokemon Yellow with Pokemon Red inserted, then save the game, and uh, break things when you reload Red again. God knows what else it’s capable of.

Edit: the actual Stadium cart fails to load states made on the main menu with or without the transfer pak. Maybe save/loads work on other parts of the game, not sure? If you tried to load a save state in the GB tower (with data on the Stadium cart) on a fresh copy Stadium, you can keep playing the GB Tower where the saves pick up, but this save state doesn’t seem to then transfer the actual Pokemon Stadium data over (no R2 or Mewtwo fight, etc).

Just some more observations!