You have to beat the Elite 4 and then help Celio on One Island get the Ruby and Sapphire. The Ruby you can find on One Island, the Sapphire is on Seven Island in the Dotted Hole (But before you can get into the Dotted Hole you have to help the one Elite 4 member in the Ice Cave on Four Island.) But then someone takes the Sapphire and goes to Team Rocket's Warehouse on Five Island. You then have to beat the 2nd in Command of Team Rocket to battle the guy who took it and get it back.
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Complete the quests on the Sevii Islands.
Beat the elite four and if he is still there obtain at least 60 pokemon data
you go to Cerulean city up a bridge turn left go down use surf go to the guy that stands in front of the cave talk and you are in
This is not the team magma cave that is team aqua cave. Team magma cave opens when you have the magma symbol.
You need to get the national pokedex and then get all the Kanto badges. Then go to Cerulian City and go to the cave where the guy was blocking the entrance.Then you go to the bottom floor and search around. He will be there as long as you defeated red at Mt.Silver.You can also go to Cerculean Cave and find Mewtwo, lower his HP to 1%, put him to sleep, and then throw a regular Pokeball to catch him.You find him at Cerulean cave, but first you must beat all sixteen gym leaders. Then go to Cerulean City, go over the bridge to the north, go left, then surf immediately south until you see a cave. He is level 70 and knows really bad moves (apart from physic) so bring a dark type and he cannot do any damage to you.Mewtwo is located in Cerulean Cave. You can access Cerulean Cave after you get all 16 gym badges.Cerulean Cave, Kanto You Will Need: Max Repels x10 Different Sorts Of Pokeballs x? Strong Pokemon x? And Mewtwo Is Lvl 70when you do something you will be able to go in the cave in crulen city.(in kanto).i would whatch it on youtube so you know the path to get there.