It depends.
It helps to get it with on HP by using Hyperfang or false swipe and you make it paraylzed or frozen.
Also save before trying to catch ANY legendary JUST IN CASE it faints so you can just turn the power off and retry.
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Use an Ultra Ball, not a Master Ball
I caught it with an ultra ball. Best is to lower it's HP and catch it or put him to sleep. but you need 10-15 ultra balls or more. Depends on his HP.
You would need to get the Action Relplay at GameStop.
other than a masterball probaly with a hacked ball cherish or ultra,timer,heal,and quick ball
Using a Great Ball is the best way. Actually a Ultra ball is the best way.