master ball if you havent already used it.
Master Ball
catch him at lvl 70
you can catch mewtwo in cerulean cave in cerulean city but first you have to beat the elite four
You need to catch a larvitar then train it to level 36 then train pupitar to level 55 to obtain a tyranitar.
After you catch mewtwo you go and beat the Pokemon league again to go and catch the legendary dogs!!!!!!!!!!
If you have killed him ... your f*cked, sorry :(
To get a Tyranitar, you have to catch a Larvitar on 7 island and make it evolve.
uhh... you can't...you already killed it
You can't catch a tyranitar you will need to train a larvitar to get one. It must be level 55 to become tyranitar.
you have to go to spear pillar with a death stone bring your mewtwo use the death stone on the mewtwo mewtwo will get killed and mewtwo spirit will come and mewtwos spirit is mewthree catch it and there u go (i actually did dis mewthree is not a hack i know)
masterball
You can't catch Mewtwo in Pokemon Diamond and pearl and also platinum. But you can catch Mewtwo in heartgold and soul silver
how do you catch a mewtwo on Pokemon platinum
you can't catch mewtwo he is too tough to catch but if you don't listen to me you are a NOOB
Lugia its easier.
you can't. u can get mewtwo, though. <(.^_^.)>this should help!
Master Ball