I've been working on a very large H parody of Pokemon over the past 3 years. This old video shows a little of what the game can do, and the plans I have for it.
You can download the playable demo and level editor for the game.
All of the game's programming is complete. But I still have to make more levels and graphics. So far, Pallet, Viridian, Pewter, and Cerulean city are complete.
Feel free to play around with the editor and make your own pokemon game. I'll keep working on my version, but there's no reason you can't have fun and make your own.