Where can I find the dawn stone in Pokemon SoulSilver or Pearl?

Question

I have beaten the elite 4 in both games so if I can only obtain them in aftergame I am able to get them.

Answer 1

In Pearl, you can get a Dawn Stone on Route 225.

In SoulSilver, you can get a Dawn Stone by coming first in the Bug-Catching Contest, in Mt.Silver, and also in Route 17 by a Pokegear phonecall.

Source