Yes you can just put him to sleep or get his health real real low and keep trying or get
his heatlh real low then put him to sleep and try it... Do it with the greatest balls you
have like a ultra ball and try alot if it fails good luck 2 u

this is very possible, i have all but 1 legendary in my game and i have used one master
ball, the rest i used ultra ball. if want to do that then yu have to get the level 50 and
up legendaries to about 1 health.

yes

I caught groudon with a poke ball .There is a cheat u can use . press b contunsly while
he is in the ball can work for anyone

just put groudon into sleep and make him weak then trhow an ultra ball.