Pokémon Blue Version (French) - Catching Mewtwo

After beating the Elite Four, you’ll have access to enter an unknown dungeon known as the Cerulean Cave. The Cerulean Cave has mazes with water around some spots. Once you navigate the mazes, go to the B1F of the cave where you’ll meet Mewtwo. Save your game before you interact with it. Mewtwo is on Level 70. If you still have the Master Ball, it would be the time to use it. Otherwise, use sleeping-inducing moves and Ultra Balls. Mewtwo will use Recover when low on HP and Psychic to lower the target’s Special stat. Its Swift attack can’t be avoided and Barrier makes it much more defenseful. This is the last side-quest of the game before your mission in this game is fully complete.