A Pokémon fan dies in our world at the same time as the original Ghetsis falls down the stairs in his castle and slams his head against the door with enough force that there's some brain smeared on the door. Arceus is rather bored and has an idea. Ghetsis of course dies but due to devine intervention the Pokémon fan is reborn in Ghetsis's body. This will be very interesting Arceus thinks to themselves.