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Small quests in Kanto

Quest Where it starts Reward
Pokémon Mansion statues Pokémon Mansion, Cinnabar Island Secret Key (opens the Cinnabar Gym)
Mewtwo Strikes Back Dr. Fuji, Cerulean City 15,000 F, Mewtwo roaming Cerulean Cave

The Secret Key lies behind a locked door on Pokémon Mansion B1F. The door opens when you inspect the mansion’s 11 Mewtwo statues in the right order.

Each floor’s map has its statues spread out. Walk up to a statue and press the action button (or tap).

Step Floor Where on the floor
1 1F Top-left corner
2 2F Left side, upper part
3 2F Right side, middle
4 3F Top, a little right of centre
5 1F Centre
6 B1F Top-right area
7 1F Bottom-right corner
8 2F Right edge, upper part
9 3F Bottom-left corner
10 2F Left side, lower part
11 B1F Lower half, right of centre

After the eleventh statue, the door in the middle-left room of B1F opens. Pick up the Secret Key on the floor inside. Do the whole sequence and collect the key in one go, rather than stopping halfway.

Pokemon Mansion B1FThe basement, where the Secret Key is kept.Wild Pokémon here

The Pokémon Mansion also has several items on the ground; see Items on the ground in Kanto.

  1. Talk to Dr. Fuji. He is in Cerulean City and appears once you have all 8 Kanto badges, but only gives you the quest after you become Kanto Champion.

    Mewtwo, born from his experiments, has awakened in Cerulean Cave. The cave itself is open to every Kanto Champion.

    Dr. Fuji standing in the north-west corner of Cerulean City with the player in front of him.
    Dr. Fuji waits in the north-west corner of Cerulean City.
  2. Beat Giovanni. He is on Cerulean Cave 2F. Team Rocket grunts guard 1F and 2F on the way.

    His team: Ursaluna, Celesteela, Garchomp, Nidoking, Great Tusk and Mega Mewtwo Y, levels 85–91.

    Cerulean Cave 2FCerulean Cave 2F, where Giovanni waits.Wild Pokémon here
  3. Meet Dr. Fuji on B1F. He admits he cannot control his creation and leaves.

  4. Face Mewtwo. It waits in the deepest chamber of Cerulean Cave B1F. Its team is all level 120: Gengar, Hoopa-Unbound (Hoopa Unbound), Iron Boulder, Naganadel, Tapu Lele and Mega Mewtwo X. This battle is not a catch.

    Cerulean Cave B1FThe deepest floor of Cerulean Cave, where Mewtwo waits.Wild Pokémon here
  5. Catch the roaming Mewtwo. After the battle, Mewtwo roams Cerulean Cave. Use the Roaming Pokemon Tracker to find which floor it is on, then catch it as a normal wild encounter.

A Mewtwo you catch this way counts as caught by you, so it can become Armored Mewtwo; see Project T.E.R.A..

After the quest, Mewtwo also waits on Cerulean Cave B1F as a weekly Champion battle, with a difficulty you choose and one of three teams. See Gyms, Elite Four and Champions.