Pokémon Black & White. Downloaded it and played it on an emulator the day it came out, despite thinking it would be total crap and even worse than Diamond & Pearl (the games that originally made me stop caring for Pokémon in general), ended up loving them. Of course, I've since bought both the game and console, and replayed it legally and all that stuff.

Unfortunately, Game Freak still ended up having the last laugh by making me fall out with the franchise once more from Omega Ruby & Alpha Sapphire onward.