Lower its HP until it's at the Red marker.
Find it again, then put it to sleep with a fast Pokemon. (Suggest darkrai)
Get a variety of poke balls and throw them at the Pokemon to try and catch it.
If you have used poke balls a lot of turns then throw a TIMER BALL.
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you cant catch it anymore
how do you catch a mewtwo on Pokemon platinum
you cannot catch the 3 regi's in Pokemon platinum you have to catch them in Pokemon emerald then transfer them to Pokemon platinum. thnx
well in Pokemon platinum you can just get the member card and get darkrai after getting darkrai you can get cresselia
::::::You can not get cresselia in Pokemon heartgold::::::::::::Yes you can!!! I have one! Well i have 2 because i got them from a trade but i sitll have them!:::: :Dno u dont you need to catch it in pearl and trade