You receive an event item (oak's letter) and go to route 224 and go to the weird stone and professor oak will be there. Talk to him and he will ask you something (I can't remember). Reply anything and a path will appear called seabreak path and you go down it and shaymin will be there but it will run away. Chase it Dow n the (really long) path and you will enter a small flowery island and you battle shaymin. Don't bring your strongest Pokemon because shaymin is only lv30.
if you have the Nintendo event
trade or catch one
No, you can't!
with the oak's letter event, you can catch shaymin.
You can't unless you catch it on the event or you cheat and use action replay
Shaymin is an event pokemon,so you must wait for the next shaymin event.You can keep track of events at serbii.net
you need the event called oak's letter for it
You need Oak's letter. you can get this from an event or use an action replay
The only ways you could have gotten a Shaymin are:Mystery Gift- March 8 & 9, 2011Trade from Platinum
SIMPLE, YOU CAN'T YOU NEED TO CATCH IT IN DIAMOND OR PEARL THEN TRADE IT. Improvement: You need Oak's letter.
All Legendary Pokemon you can catch in Platinum: Giratina, Azelf, Mesprit, Uxie, Dialga, Palkia, Heatran, Regigigas, Cresselia, Darkrai, Articuno, Zapdos, Moltress, Regirock, Regice, Registeel, Shaymin, Arceus. (Darkrai, Shaymin, and Arceus can only be got by events).
You can catch the same Pokemon you can catch in diamond only now you can catch shaymin in 2 different forms,catch giratina in 2 forms and rotom in 5 forms.