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

HeartGold/SoulSilver

Non-repeatable
- Mt. Silver Cave (West of the western cave entrance; requires Rock Climb)
- Silph Co. (Held by Steven's traded Beldum)

Repeatable
- Route 17 (Occasional gift from Biker Aiden if player has his phone number)
- Bug-Catching Contest (post-National Dex, first place)
- Pokeathlon Dome (3000 points, Tuesday/Wednesday/Friday/Saturday)

Diamond/Pearl

Non-repeatable
- Route 225 (Requires Rock Climb, ledge in the north)
- Mt. Coronet (Requires Surf, south corner of the first floor)

Repeatable
- Pickup (Level 51-100, max chance of 10% starting at Level 71)

---

Dawn Stone (Bulbapedia)

Answer 2

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