Pokémon Yellow

Pokémon Yellow's Extreme Randomizer keeps Pikachu as your starting partner but randomizes its typing, moves, and evolution path alongside everything else. The Gym Leader battles that normally mirror the anime — Brock, Misty, Lt. Surge — become completely unpredictable at the typing and moveset level. Your rival's Eevee evolves into something genuinely random, not just one of the three Eeveelutions.

Your starter Pikachu in Yellow extreme mode may no longer be Electric-type at all — its typing, evolution, and moves are all randomized while it still follows you on the overworld. The anime-faithful Gym Leader scripting remains in place, creating a strange contrast between the story's type-based narrative and the extreme-randomized reality of every battle.