Is there a way to catch mewtwo if you fainted it on accident?

Question

i accidently fainted my mewtwo and it wont reappear can someone help

Answer 1

Defeat the elite 4. Go back to where you found mewtwo and he will be there again :)
Hope I helped :)

Comments

I think only 3 times that way so beat the elite 4 and save before encountering him

Answer 2

if you saved just before encountering mewtwo you can shut the game off without saving and turn it back on. if you have already saved after the encounter, challenge the elite four again and mewtwo would have recovered.