Question

Its big, seemingly important, and cool looking, so what does do because it MUST do something special extra deatail- past victory road at the cliff, the flat shiny white rock

Answer 1

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.)

Comments

So the rock does nothing?

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If you have the event item, you can catch shaymin.

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The Event item that you are looking for is called OAK'S LETTER, Witch can let you have access to do a SHAYMIN EVENT but first if you do have it, then answer this to Professer Samuel Oak.

Who Helped you the Most out of the Journey at the Sinnoh Reigion/ who helped you get the pokemon that you can't even get for the pokedex/ or Whitch pokemon helped you all the way to the End?