Curvy Path

The only way to get back there is to beat the Elite Four first. You may also have to get the National Pokedex, but I'm not exactly sure. Once you do, you can go back there. Have you ever noticed someone close to the end of Victory Road blocking a path to another room? If so, that guy will be gone after you've beaten the Elite Four. Go all the way through the extra path of Victory Road, and you will be in that 'curvy path above the Pokemon League', which is also called Route 224. At the very end of Route 224, you will see a huge rock. That will trigger the Shaymin Event when you use the AR code for the event. Another path, really long by the way, will magically open. The very end of the path, where you find and catch Shaymin, is called Flower Paradice. Shaymin will be at level 30, so don't be too harsh to it.

Hope this helps,
Sk8rboy

Well that curvy path above the Pokemon league on the map is route 224. That is where you can find shaymin once you go to the Pokemon event. Also you may find other Pokemon there too. I hoped I helped you out.

~Twilight_Sasuke~

It is the path to shaymin I belive. However don't spend your time trying to get there, because it is only possible after going to an event.

THERE IS ANOTHER WAY TO GET SHAYMIN!!!!NO JOKE!!! First you google primary DNS code for shaymin and go to any websites that google suggests and it will show you a code. Then go to Wi-Fi settings on your Pokemon diamond game and change Auto obtain DNS code to NO.Then type in the code you googled in the primary DNS thing. THen go to the Global Trading Station in Jubilife City and talk to the lady at the front desk. Then you save and go into the Global Trading Station. You should end up at that little PC box thats green and a pokeball should come flying down. Inside t is a shaymin!!! I am serious this works I have got a shaymin, jirachi, arcues, two MEWS, and I am about to get a celebi. All by doing this!!!!