**POSSIBLE SPOILERS!** If you're talking about the path that is blocked by a fat guy in Victory Road, that path leads to Route 224, where you can see a white rock, and catch the legendary Pokemon, Shaymin (But there is an event for it, sadly.) But before you go there, you need to accompany Marley through the Victory Road part which is blocked off by the fat man. She mentions the "Pokemon of Gratitude" or the "Pokemon among flowers" very often, which is Shaymin. Hope this helps!
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VICTORY ROAD IS BEST
you have to catch the legendary in victory road then talk to him
after you beat the elite four and get the national poke dex you can go in the cave inside victory road with the man blocking it
You have to see every Shinnoh Pokemon then see professor Rowan.
U can get it at battle tower but u need 48 bp i think? Im not for sure but around there