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You're allowed to make a romhack about your favorite pokémon game. You can't make overhauls, you can just add or change something in the game that in your opinion will make it better.
>HGSS:
>Add a water route that connects Cherrygrove City to the water section in Route 32
>Mt. Moon goes back in its original form from the Kanto games
>HGSS:
>Add a water route that connects Cherrygrove City to the water section in Route 32
>Mt. Moon goes back in its original form from the Kanto games