Red & Blue Pokémon Mansion
A scorched, abandoned mansion on Cinnabar where you track down the Secret Key to Blaine's Gym amid Mewtwo's origin journals.
Pokémon Mansion is in Kanto. In the story you arrive from Cinnabar Island through its entrance and it comes before Route 21.
POKéMON MANSION MAP
Pressing the switches hidden in its statues swings walls open and shut, and the path down only appears once you hit the right ones. It is three floors and a basement, doubling back on itself.
Pokémon Mansion Walkthrough
1F
- The basement stairs lie in a 1F wing the front door never reaches, and only a drop from 3F gets you there.
- Walk north up the west hall and take the stairs up to 2F.
2F
- Leave the statue beside your landing alone; flipping it closes off the north stairs.
- Climb the stairs on the east side of your landing up to 3F.
Calcium3F
- Fight the BurglarBurglar₱3,420
NinetalesLv 38Weak toWaterGroundRock and his lone Ninetales, search the top of the west passage for a hidden Max Revive, and take the southwest Max Potion. - Return downstairs, walk east and north up the hall, then west through the open gate to the top stairs.
- Go east and south to the statue under the top hall and press it.
- Pass the gate it opened and head east until the Scientist spots you, then drop down a western hole; the eastern one lands on 2F.
Highest-level fight · fight 1BurglarNinetalesLv 38₱3,420NinetalesLv 38
Max Revive
Iron1F
- Head south until a ScientistScientist₱1,450
ElectrodeLv 29
WeezingLv 29Weak toGroundPsychicBug spots you, then circle west around the wall. - Follow the lower hall east, collect the CarbosCarbos1F of the Pokemon Mansion, and go down the stairs to B1F.
CarbosB1F
- Go north, west and south through the open gate to take TM14 BlizzardTMTM14 BlizzardIceClassSpecialPower120Accuracy90%PP5An attack that may freeze the foe.WhereOn B1F of the Pokemon Mansion, battle the BurglarBurglar₱3,060
GrowlitheLv 34
PonytaLv 34Weak toWaterGroundRock in that room, then press the statue beside it. - Collect the Full Restore through the west gate that press opened. Then go north, east along the middle hall and up the east corridor until the Scientist spots you.
- Press the statue in the northeast room, then head west down the long hall and pick up the Rare CandyRare CandyB1F of the Pokemon Mansion in the room above it.
- Collect TM22 Solar BeamTMTM22 Solar BeamGrassClassSpecialPower120Accuracy100%PP101st turn: Prepare 2nd turn: AttackWhereOn B1F of the Pokemon Mansion beyond the gate that press opened and take the Secret Key further south. Then search that room's top-left corner for a hidden Rare Candy.
- To leave, press the northeast statue again, loop back to the south statue, then climb to 1F and exit by its southeast door to Cinnabar Island.
TM14 Blizzard
Rare Candy
TM22 Solar BeamRare CandyPokemon Encounters
The burned mansion is a Fire and Poison den running from level 28 to 42. Growlithe marks the Red version and Vulpix the Blue, Magmar shows up only in Blue, and Grimer, Koffing, and Ponyta crowd the rest of the halls.
Grimer
ITEMS
The Secret Key buried in the burned mansion unlocks Cinnabar's Gym, making this dungeon mandatory. TM14 Blizzard and TM22 Solar Beam are the moves worth the trip, with three vitamins among the rubble.
TM14 Blizzard
Blizzard deals damage and has a 10% chance of freezing the target.
TM14 Blizzard
Blizzard deals damage and has a 10% chance of freezing the target.
TM22 Solar Beam
The user of Solar Beam will absorb light on the first turn.
Carbos
Raises Speed effort and happiness.
Calcium
Raises Special Attack effort and happiness.
Iron
Raises Defense effort and happiness.
Rare Candy
Causes a level-up and raises happiness.
Rare Candy
Causes a level-up and raises happiness.
Escape Rope
Transports user to the outside entrance of a cave.
Max Potion
Restores HP to full.
Full Restore
Restores HP to full and cures any status ailment and confusion.
Secret Key
Gen IV: The key to Rotom’s appliance room. Gen III: The key to Cinnabar Gym.
Max Revive
Revives with full HP.
TRAINERS
Burglars and Scientists hold the burned mansion, the Burglars' Fire-types climbing to level 38. Pack a Water move for the Secret Key hunt.
Pokémon Mansion Guide
Without it, Blaine's Gym back on Cinnabar stays sealed, so this is a required stop, not optional loot. The key sits in the basement, and the statue switches on the floors above are what slide the walls aside to open a path down to it.
Journals scattered through the burned mansion describe how Mewtwo was created from Mew and then broke loose, the same Mewtwo you can later catch in the Unknown Dungeon. They're pure story flavor with no item attached, but they're the only place the games explain where Mewtwo came from.