Recalling a diary he encountered during his travels, Red deduces this to be an artificially made Pokémon named Mewtwo.
Mewtwo |
This is a perfect fit for Mewtwo’s band, so thus they settle in the top of Mt. Quena and begin a new, safe life, with Mewtwo watching over as their guardian, as he feels they cannot belong in the world as they were not born in it (Interestingly enough, he seems particularly close to the Pikachu and Meowth clones, possibly reflecting how important their templates were in his change of heart).