How do you get Mewtwo in Pokemon Emerald?

The only way to get Mewtwo in Emerald is to trade it from Fire Red or Leaf Green.You can not get Mewtwo in Emerald. Trade from a game that has it.
With a master ball
you have to trade from leafgreen/fire red. get all the bagis in the battle frunt ter ryn6y unfortunally yer can t unless u hack ahahahaha