you can't catch it because you already beaten the legendary
Well it depends. A Pokemon with a higher catch rate means its easyer to catch. Rare Pokemon usally has a low catch rate. Go check serribi pokedex to check catch rate. Hope it helps!!
catch a gloom
not alot you can catch other players Pokemon that's it
you cant catch it in gold if its a boy you can catch it in blue if its a girl you can catch it in purple
there all over sinnoh just weaken and catch.
after freeing the 3 anc Pokemon go to the spear pillarafter capt giratina go spear pillar
catch them, finish dex, get marking map[jublife city], or complete elite for if you haven't.
trade
yes with the up-grade
there are no new Pokemon species on platnium, but there are new formes for rotom, giratina, and shaymin.
because pokemon platinum has 4th generation pokemon. Pokemon black and white contain 5th generation pokemon
Yes it is scheduled to release march 24 i think
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you need to go to mt. coronet's top or snow area to get one
Im sorry you can't duplicate Pokemon in Pokemon platinum. You can duplicate Pokemon in diamond/Pearl or emerald the trade or migrate them to platinum though.
When you start the game you can choose it as a starter or you could get it from a friend or from the GTS in Jubilife City.