ok does the medusa method work if a us game is registered as a different country on that globe thingy
No, it doesn't. The Masuda method is when you have a Foreign pokemon and breed it with a pokemon from your game. For example, a Japanese Ditto with an American Zorua, or a French Magikarp with a German Magikarp. The Pokemon itself has to be from a different country, so registering as a different country than the game itself on the Globe would not work.