Throw a masterball at it.
You can catch more legendary pokemons on platinum. So you can catch more on Platinum, then the other games :)
The best place is route 211 where you get ponyta (there are some).
well to opinion the best beginner in Pokemon platinum is chimchar
the best Pokemon you can catch in Pokemon pearl is heatran
chase it with the first team member that is faster than it and teach the mean look so the Cresselia can't run
master ball
Arceus or Spiritomb. It depends on who your going to fight.
in etrena forest
Master ball
You can catch more legendary pokemons on platinum. So you can catch more on Platinum, then the other games :)
The best place is route 211 where you get ponyta (there are some).
you will encounter giratina, either catch him that's best, or defeat him
try your best to find spirtomb in Pokemon platinum
Steelix
Darkrai
the best way to GET legendaries is by action replay. and the best way to CATCH legendaries is lowering there hp and catching them. or choosing the right pokeball:masterball,ultaball,repeatball,greatball,and pokeball.
6 bidoof