Pokémon Adamant is my first attempt at creating a Pokémon FireRed ROM hack. I did have some ideas for it, though nothing was ever finalized nor decided (exluding a list of Gym Leaders I still have in my Dropbox). I’ve reworked some of the ideas for Pokémon ObsidianBlack & PewterWhite. This project was mainly a learning experience and was never intended to get anywhere, except maybe during first few weeks of development.
As for changes, the Pikachu line was made legendary and a cave was even made where you can catch Pikachu. Some of the other existing towns, as well as the cave, can be seen in the video that I once uploaded.
Videos featuring Pokémon Adamant can be found in this YouTube playlist.