The game follows a very similar story beat to Pokémon Red/FireRed, except for the invention and widespread use of Pokémon Fusion Splicers. Starting in Pallet Town, you receive your starter from Professor Oak, your rival proceeds to get the two you did not choose and fuse them for your first battle. Team Rocket are the main antagonist, attempting to fuse three legendary Pokémon by experimental methods to take over the region. The gym leaders and overall story contain some of shape of Pokémon Red, however some tweaks were made to account for the new mechanics, expanded map, additional Pokedex entries, and full post-game.