I can't get to the flower paradise on my platinum version to find shaymin,so I've been searching for answers but everyone says you need oak's letter.i have oak's letter but I don't know what to do with it to get to the flower paradise.Help?
On Route 224, at the end of the route, there is a stone. Interact with the stone and Oak will appear. Talk to him and say you love Pokemon, and a road to Flower Paradise shoudl appear.