There is no Code to warp to Johto as Johto is not available in Pokémon Emerald in any of it's coding. Only Hoenn is available in Pokémon Emerald. Only Pokémon Gold, Silver and Crystal, along with the Gold and Silver remakes, let the player access regions that aren't part of the main setting of the game.
Yourvkom
Mirage Island Game Shark CodeThere are no Gameshark Warp codes in Emerald to get to Mirage Island. There is a code but it will hardly work7572668C A25C844CUse this and maybe you can get there
4D2A5A81 4E69A107 Battle Frontier
you can only warp to the southern island in Emerald version if that's what you meant. You'd need a Gameshark for Emerald version.
Master code (it is required to be on): D8BAE4D9 4864DCE5 A86CDBA5 19BA49B3 Warp to Birth Island: 4A99A22B 58284D2D After you are done using the code, disable or remove the code to prevent you from looping the warp.
Yourvkom
There is no Johto league.
Mirage Island Game Shark CodeThere are no Gameshark Warp codes in Emerald to get to Mirage Island. There is a code but it will hardly work7572668C A25C844CUse this and maybe you can get there
4D2A5A81 4E69A107 Battle Frontier
you can only warp to the southern island in Emerald version if that's what you meant. You'd need a Gameshark for Emerald version.
You Type The Gameshark code in and the next door you walk in you teleport(depending if the code works)
F0EC26B8 31EC5657
i think you have to add a new code when you press sideways on the gameshark, on the warp. It will mostly work in emerald
Master code (it is required to be on): D8BAE4D9 4864DCE5 A86CDBA5 19BA49B3 Warp to Birth Island: 4A99A22B 58284D2D After you are done using the code, disable or remove the code to prevent you from looping the warp.
you dont
YOU MUST HAVE AN ACTION REPALY FOR ACTIVATE THE CODE YOU MUST HAVE AN ACTION REPALY FOR ACTIVATE THE CODE
You can only get the Johto starters by trading from Emerald or XD.