trjessie is partially right. Although you can get them usign an AR, depending on the code you use, you may or may not be able to use it. Gameshark has similar problems, but as well, there are a few different codes you can use to get them. For example, the 'catch-this-pokemon-in-this-route' code might work, but the 'unlock-the-ability-to-go-to-this-place' code might not. You just have to release your pokemon and try again, probably with another code or device, and forever know that code wont work. Unless of course, you found a bypass code.