We've seen quite a few fun (and unofficial) ROM hacks which have tinkered with famous Nintendo franchises, but a new effort has just been announced which looks very interesting indeed.
DogPond4 has just confirmed that they're working on a new ROM hack which adds Mario and Luigi to the Pokémon series, using the GBA remakes as the base.
Pokémon Mario Red & Luigi Green (genius, right?) will replace all 151 Gen 1 Pokémon with characters from the Super Mario universe, "along with plenty of surprises," according to the developer.
While you're waiting for this one to drop, why not check out our list of the best Pokémon ROM hacks?