Pokémon FireRed and LeafGreen/Cerulean Cave

'The strongest Pokemon in the game now await you within Cerulean Cave. Prepare lots of healing items, a lot of Ultra Balls and heal up your Pokemon before you tackle this difficult challenge!'



Cerulean Cave is the final proving spot for the most advanced of trainers. Located north of Cerulean City, you must surf to reach the entrance.

You cannot obtain access to the cave until you beat the Elite Four, and deliver Celio the Ruby and Sapphire gems to allow for free trade. Within you will find the strongest wild Pokemon in the game, including the greatest of them all: !!!

Cerulean Cave 1st Floor


Feel free to battle the powerful Pokemon here and pick up the items, but if you want to reach Mewtwo as soon as possible, you must reach the stairs at the middle of the map to access the right route.

Items

 * Max Elixir: Near the center
 * Full Restore: Southwest corner of the map
 * Nugget: Northwest corner of the map
 * Ultra Ball (hidden): near the Nugget

Capturing Mewtwo
is a level 70 Psychic Pokémon and considered to be the strongest Pokémon in FireRed/LeafGreen. You can expect Mewtwo to know the moves, , , and.

Tips:
 * As always, before tackling a Legendary Pokemon, SAVE YOUR GAME
 * Try to paralyze Mewtwo with an Electric type or a fast before Mewtwo uses Safeguard, then weaken Mewtwo down to red health.
 * Mewtwo will use Recover when it is weakened (it makes for quite a hassle as the move has 10 PP).
 * When you finally manage to get Mewtwo's health down to red, throw Ultra Balls. Bringing a minimum of 50 is recommended.
 * After a lot of turns have past, start using Timer Balls.
 * Expect this battle to take a long time, so be patient and eventually Mewtwo will surrender to you.

Capturing a Legendary Beast
After defeating the Elite Four for the first time, one of the Legendary Beasts will be available for capture, running in the wild grass somewhere in Kanto. Which of the Beasts you'll be able to capture is determined by your starter Pokemon. If you chose Bulbasaur, Entei will roam Kanto. If you chose Charmander, Suicune will be available. If you chose Squirtle, Raikou is your challenge.


 * Tips


 * To find the Beast quickly, head to Vermillion City, and buy a good number of Super Repels. Place a Pokemon Level 40 in the first position and head East towards Route 12, past Diglett's Cave. Activate the Super Repel and run through the grass. If you do not find the Beast, head into Diglett's Cave and quickly back into Route 12. This will reset the Beast's position on the map. Repeat as necessary until you meet the Beast!


 * The main problem lies on that the Legendary Beasts are bugged. If you fail to capture the Beast on the first time you meet, it will run away, NEVER to be seen again! Thus, I hope you kept that Master Ball!

Congratulations! You've acquired two legendary Pokemon!