If you reach Cinnabar Island in Pokémon FireRed and LeafGreen and head straight to the Cinnabar Island Gym, you're greeted with a locked door. The
Secret Key is hidden inside the Pokémon Mansion to its left, and is required for access. Head there to find the key, then come back to the Gym.
Inside, there are six rooms to get through before reaching Blaine. The puzzle is a bit different than previous gyms. Instead of navigation, it's a set of trivia questions. You can battle each of the trainers to open the doors to get into the subsequent room, or you can answer questions at the trivia stations to skip the fights.
Blaine and the Cinnabar Island Gym trainers have
Fire-type Pokémon. Load up on
Water-types before you head over here. It's recommended that your Pokémon are roughly Level 40-45 at this point.
Fire-type Pokémon are weak against
Water-,
Ground-, and
Rock-type Pokémon. Blaine's four Pokémon have tough
Fire-type moves, so you need to be ready with items to heal burns.
Players that started with
Squirtle and now have
Blastoise are at an advantage here. Teach it
HM03 (Surf) to help deal more damage. If you started with either
Charmander or
Bulbasaur, a good option is
Lapras. You should have picked up a
Lapras at the Silph Company building. Like
Blastoise, it can do a ton of damage by teaching it
HM03 (Surf). For a
Ground-type Pokémon,
Dugtrio with Dig and Magnitude or
Marowak with Bonemerang work decently well. You may have found a
Dugtrio early on in Diglett's Cave. If not, head back there to catch one and level it up.
Marowak can be evolved from
Cubone, which is found at the Pokémon Tower in Lavender Town.
To get to the next room, you must either answer trivia questions at the trivia stations, or battle the trainers guarding the doors. It's recommended to battle the trainers, because it's a good way to boost your Pokémon's experience points. However, if you'd like to just breeze through, here are the answers for each room, in order.
Growlithe (Level 36)
Vulpix (Level 36)
Ninetales (Level 36)
You're awarded 3,168 Pokédollars for winning.
Vulpix (Level 36)
Vulpix (Level 36)
Ninetales (Level 36)
You're awarded 864 Pokédollars for winning.
Ponyta (Level 34)
Charmander (Level 34)
Vulpix (Level 34)
Growlithe (Level 34)
You're awarded 816 Pokédollars for winning.
Ponyta (Level 41)
You're awarded 3,608 Pokédollars for winning.
Ponyta (Level 41)
You're awarded 984 Pokédollars for winning.
Vulpix (Level 37)
Growlithe (Level 37)
You're awarded 3,265 Pokédollars for winning.
Growlithe (Level 37)
Vulpix (Level 37)
You're awarded 888 Pokédollars for winning.
Growlithe (Level 42)
Rapidash (Level 42)
Ponyta (Level 40)
Arcanine (Level 47)
You're awarded 4,700 Pokédollars, the Volcano Badge, and
TM38 (Fire Blast) for winning.