you need to do the Pokemon league
Beat the Elite 4 then yhe guy will move and you will be able to catch mewtwo
Yes, he is in that cave you see right above Cerulean city. The only problem is the guy blocking it is only going to move after you beat the Pokemon league.
After you catch mewtwo you go and beat the Pokemon league again to go and catch the legendary dogs!!!!!!!!!!
i hate pokemon!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
I wreckon Mewtwo is the best Pokemon to get Leaf Green. You can get after you bring the ruby and sapphire to Celio on Island 1. It is Lv 70 and it is in Cerulean Cave. I got a Mewtwo with around 326 special attack. Mewtwo also has the best recovery move in the game.
That would be waterfall which can be found in icefall cave on four island.
Articuno is in a frozen cave Zapdos is in a Power Plant (by Rock Tunnel) I've forgotten where Moltres is. Mewtwo is in Cerulean cave (beat the elite four and the girl will move)
First you have to get all the kanto badges ( which can't be obtained if you didn't beat the Pokemon league ). Then, the guy in front of cerulean cave will move and in the deepest part of cerulean cave mewtwo will be there at level 70. His attacks are Power swap, Guard Swap, Psycho Cut, and Amnesia.
Mewtwo is deep within the cave. The only move you would need it surf. But If you want to get through it without going back for items, have a Pokemon with rock smash and Strength. It takes awhile to get to him, but you can do it! I've played Firered 3 times, and I'm like a pro at that cave. But when HG/SS came out, I didn't know what to do. Since the newer games have cliffs and mountains ( unlike the old games) I was all confused. Just keep adventuring the cave, you'll find it.
I don't no how to get the old sea map or chart but you must have fire or leaf In FireRed or LeafGreen, you have to beat the Elite Four before you can battle Mewtwo. You'll find it in the Cerulean Cave in the northwest corner of Cerulean City. You have to cross water, move boulders, and smash rocks, so bring Pokemon that can use Surf, Strength, and Rock Smash. Mewtwo is level 70.
with the pokeflute, you must wake it , then you battle him . if you defeated him or catch him, he will move and you may take entrance into the diglettt cave
Use the pokeflute.