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Buried somewhere in the rubble of Pokémon Mansion is the Secret Key that opens the Cinnabar Island Gym. There are plenty of salvageable items amongst the wreckage, as well as clues regarding the dangerous experimental Pokémon that escaped. Hunt carefully, as there are lots of powerful Pokémon here as well!

Pokémon Mansion

Dr. Fiji's Journal
The pages from Dr. Fuji's journal are scattered about the mansion. These entries detail the discovery of a Pokémon known as "Mew".

Unlocking the many doors throughout Pokémon Mansion requires pressing the buttons on the statues on each floor. The maps show you the doors in their default positions, so you can predict which ones will disappear when you press the buttons. Push them as needed to make your way through the level and collect all the items.

Ditto that
The mansion's basement is the only chance for Yellow players to catch a shape-shifting Ditto prior to the Elite Four.

Yellow players can pick up a Growlithe and a Ditto. Red and Blue can get a Ponyta, and Blue can also get an ultra-rare, Blue-exclusive Magmar.

The items include a number of stat-enhancing supplements, and two TMs. TM 22 is the most powerful Grass attack, Solarbeam, and TM 14 is the super-powerful Ice attack Blizzard, which you'll definitely need for the Elite Four. There is also a hidden Moon Stone in one of the pillars on Floor 1, right after you enter the mansion. There is a hidden Max Revive on Floor 3, at the top of the narrow path above marker A. There is a Rare Candy in the basement, in the room with the Secret Key near the top-left corner (above the plants). Also fight all the Burglars that you can — they'll give you good EXP and a ton of cash.

Getting the Gym key

The door to the Gym is locked, and rumors suggest the key is lost in the abandoned mansion. You can get through the mansion fairly quickly, but the random Pokémon that lurk here, especially a wild Muk, can be fierce.

To get the key, take the stairs to the main part of Floor 3 (A to C), search the statue for a hidden switch, then jump down the first balcony near a scientist marked point D. The stairs here will take you to the basement where the Secret Key lies. Flip all of the switches you pass and you'll find it without much trouble.

1F

1F
1 Scientist
A Escape Rope
B Carbos

Trainers

Red and Blue
Trainer Pokemon
Scientist
Scientist
Reward: Pokebuck.png1450
  • Electrode Electrode Lv. 29
  • Weezing Weezing Lv. 29
Yellow
Trainer Pokemon
Scientist
Scientist
Reward: Pokebuck.png1450
  • Electrode Electrode Lv. 29
  • Weezing Weezing Lv. 29

Pokémon found

Red
Pokémon Level Rate
Growlithe Growlithe 34 10%
Ponyta Ponyta 28,30,32,34 40%
Grimer Grimer 30 5%
Muk Muk 39 1%
Koffing Koffing 30,32 40%
Weezing Weezing 37 4%
Blue
Pokémon Level Rate
Vulpix Vulpix 34 10%
Ponyta Ponyta 28,30,32,34 40%
Grimer Grimer 30,32 40%
Muk Muk 37 4%
Koffing Koffing 30 5%
Weezing Weezing 39 1%
Yellow
Pokémon Level Rate
Rattata Rattata 34,37 35%
Raticate Raticate 34,37 25%
Vulpix Vulpix 26,30,34,38 20%
Grimer Grimer 23,26 20%

2F

2F
1 Burglar
A Calcium

The first page of Dr. Fuji's journal is in the northeast corner. The second page is in the southwest corner.

Trainers

Red and Blue
Trainer Pokemon
Burglar
Burglar
Reward: Pokebuck.png3060
  • Charmander Charmander Lv. 34
  • Charmeleon Charmeleon Lv. 34
Yellow
Trainer Pokemon
Burglar
Burglar
Reward: Pokebuck.png3060
  • Charmander Charmander Lv. 34
  • Charmeleon Charmeleon Lv. 34

Pokémon found

Red
Pokémon Level Rate
Growlithe Growlithe 32 25%
Ponyta Ponyta 28,30,32 25%
Grimer Grimer 30 5%
Muk Muk 37 1%
Koffing Koffing 30,34 40%
Weezing Weezing 39 4%
Blue
Pokémon Level Rate
Vulpix Vulpix 32 25%
Ponyta Ponyta 28,30,32 25%
Grimer Grimer 30,34 40%
Muk Muk 39 4%
Koffing Koffing 30 5%
Weezing Weezing 37 1%
Yellow
Pokémon Level Rate
Rattata Rattata 34,37 35%
Raticate Raticate 34,37 25%
Grimer Grimer 26,29,32,35 35%
Muk Muk 35,38 5%

3F

3F
1 Burglar
2 Scientist
A Max Potion
B Iron

The next page of Dr. Fiji's Journal is in a room that can only be accessed from stairwell B.

Trainers

Red and Blue
Trainer Pokemon
Burglar
Burglar
Reward: Pokebuck.png3420
  • Ninetales Ninetales Lv. 38
Scientist
Scientist
Reward: Pokebuck.png1650
  • Magnemite Magnemite Lv. 33
  • Magneton Magneton Lv. 33
  • Voltorb Voltorb Lv. 33
Yellow
Trainer Pokemon
Burglar
Burglar
Reward: Pokebuck.png3420
  • Ninetales Ninetales Lv. 38
Scientist
Scientist
Reward: Pokebuck.png1650
  • Magnemite Magnemite Lv. 33
  • Magneton Magneton Lv. 33
  • Voltorb Voltorb Lv. 33

Pokémon found

Red
Pokémon Level Rate
Growlithe Growlithe 33 15%
Ponyta Ponyta 32,34,36 24%
Grimer Grimer 34 5%
Muk Muk 42 1%
Koffing Koffing 31,35 40%
Weezing Weezing 38,40 15%
Blue
Pokémon Level Rate
Vulpix Vulpix 33 15%
Ponyta Ponyta 32,36 14%
Grimer Grimer 31,35 40%
Muk Muk 38,40 15%
Koffing Koffing 34 5%
Weezing Weezing 42 1%
Magmar Magmar 34 10%
Yellow
Pokémon Level Rate
Rattata Rattata 40,43 35%
Raticate Raticate 40,43 25%
Grimer Grimer 32,35,38 35%
Muk Muk 38,41 5%

B1F

B1F
1 Burglar
2 Scientist
A TM 14
B Full Restore
C Rare Candy
D TM 22
E Secret Key

The final page for Dr. Fiji's Journal is next to a Burglar and a Pokémon statue.

Trainers

Red and Blue
Trainer Pokemon
Burglar
Burglar
Reward: Pokebuck.png3060
  • Growlithe Growlithe Lv. 34
  • Ponyta Ponyta Lv. 34
Scientist
Scientist
Reward: Pokebuck.png1700
  • Magnemite Magnemite Lv. 34
  • Electrode Electrode Lv. 34
Yellow
Trainer Pokemon
Burglar
Burglar
Reward: Pokebuck.png3060
  • Growlithe Growlithe Lv. 34
  • Ponyta Ponyta Lv. 34
Scientist
Scientist
Reward: Pokebuck.png1700
  • Magnemite Magnemite Lv. 34
  • Electrode Electrode Lv. 34

Pokémon found

Red
Pokémon Level Rate
Growlithe Growlithe 35 15%
Ponyta Ponyta 32,34 15%
Grimer Grimer 35 5%
Muk Muk 42 1%
Koffing Koffing 31,33 50%
Weezing Weezing 40,42 14%
Blue
Pokémon Level Rate
Vulpix Vulpix 35 15%
Ponyta Ponyta 32,34 15%
Grimer Grimer 31,33 50%
Muk Muk 40 10%
Koffing Koffing 35 5%
Weezing Weezing 42 1%
Magmar Magmar 38 4%
Yellow
Pokémon Level Rate
Raticate Raticate 37,40,43,46 40%
Grimer Grimer 35,38 40%
Muk Muk 41 10%
Ditto Ditto 12,18,24 10%

New Pokémon

#88 Grimer
Pokemon 088Grimer.png

You've been fighting these guys for ages, but you've never had an opportunity to catch one until now. No big loss: Grimers (and the evolved Muk) are literally garbage. Well, maybe that's a bit harsh. It's just that Poison-types are the worst in the game, in that no Poison skill (except for maybe Toxic, which you have to use a TM to teach him) is good against the quickly-defeated computer opponents. But at least Muks get a high Attack score and decent HP.

#109 Koffing
Pokemon 109Koffing.png

Team Rocket's bizarre affinity for these gaseous blobs is probably one of the reasons they lose so much. To be fair, evolved Weezing is probably the best of the Poison Pokémon, but that still doesn't make them particularly useful. At higher levels, fear their Selfdestruct and Explosion skills... Too bad their most powerful attacks knock themselves out too!

#126 Magmar
Pokemon 126Magmar.png

Magmar is both hard to catch and exclusive to Blue, but that doesn't necessarily mean it's any good. Arcanine is probably the best of the Fire Pokémon (although Blue players would need to trade for one), but Charizard, Ninetales (if you didn't evolve it until after learning Flamethrower as Vulpix) and possibly even Flareon are all better picks than Magmar in Blue.