This is a hack of Pokémon Crystal that adds in a playable follower character. You can chat with them, or you can trade and battle with them. They have their own team.
The characters are Red and Leaf (FR/LG).
You can also complete the Pokedex without trading with another game.
This hack is dedicated to PreciousLeaf
ROM / ISO Information:
Database match: Pokemon - Crystal Version (USA)
Database: No-Intro: Game Boy/Color (v. 20210227-015730)