It's a blue sapphire-- cerulean is a color.
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Go to Cerulean Cave. To get there, you must get the ruby and the sapphire and get the national dex.
* Mewtwo can only be recorded on your PokeDex if... * In FireRed/Leafgreen: Go to Cerulean Cave (guarded when Elite Four is not beaten at Cerulean City) * In Ruby/Sapphire/Emerald: Trade from FireRed/Leafgreen when the Ruby/Sapphire is found in FireRed or LeafGreen * In Diamond/Pearl/Platinum: Send to Pal Park by any GBA game
You have to get the National Pokédex by catching at least 60 different types of Pokémon and talking to Professor Oak, and then deliver the Ruby and Sapphire stones to Celio on Island One. You can then enter Cerulean Cave.
now it is time to go to cerulean city and go into the cave that the man was blocking you from going into. and you will find mewtwo in there.
bring the Sapphire back to one island and give it to that one guy in the Pokemon center and then go and fight mewtwo in cerulean cave