Go to the Shaymin event. :)
No, you cannot catch a mew in Pokemon Platinum without cheating.
Not without cheating
No, you can't.
Cheating
no you can't get it without cheating
get the wi-fi gift oak's letter then head over to route 224!
you cant without cheating
You cant you have to buy action replay
you cant
you can't without cheating
The only way to get Shaymin in Platinum without cheating or an event is through trading it with a friend.
where to find a azure flute without action replay and cheating in pokemon platinum