Question

Where can the various evolution stones be obtained in Pokemon Soulsilver?

Answer 1

Fire Stone

Bill's grandfather, School Kid Alan (Route 36), Bug-Catching Contest first prize, Pokéathlon Dome, Warm Beach

Water Stone

Bill's grandfather, Fisher Tully (Route 42), Bug-Catching Contest first prize, Seafoam Islands, Beyond the Sea, Pokéathlon Dome

Thunder Stone

Bill's grandfather, Lass Dana (Route 38), Bug-Catching Contest first prize, Pokéathlon Dome

Leaf Stone

Viridian Forest, Bill's grandfather, Picnicker Gina (Route 34), Bug-Catching Contest first prize, Pokéathlon Dome

Moon Stone

Tohjo Falls, Ruins of Alph, Mom, Bug-Catching Contest first prize, Mt. Moon Square, Volcano Path, Night Sky's Edge, Pokéathlon Dome, held by wild Lunatone

Sun Stone

Camper Tanner (Route 13), Bug-Catching Contest first prize, Volcano Path, Pokéathlon Dome, held by wild Solrock

Shiny Stone

Bird Keeper Josh (Route 14), Pokéathlon Dome, National Park, Bug-Catching Contest first prize

Dusk Stone

Biker Reese (Route 17), Pokéathlon Dome, Bug-Catching Contest first prize, Cerulean Cave

Dawn Stone

Biker Aiden (Route 17), Pokéathlon Dome, Bug-Catching Contest first prize, Mt. Silver, held by Iron (trade Steven Stone)

Source.

Comments

You missed Oval Stone.

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Oval Stone doesn't really count for anything...

Answer 2

Dawn Stone
Johto: National Park (Come 1st in Bug Catching Contest), Mt. Silver
Kanto: Route 17 (PokéGear Phonecall)

Dusk Stone
Johto: National Park (Come 1st in Bug Catching Contest)
Kanto: Cerulean Cave, Route 17 (PokéGear Phonecall)

Fire Stone
Johto: National Park (Come 1st in Bug Catching Contest), Route 36 (PokéGear Phonecall)
Kanto: Route 25 (Show Bill's Grandfather a Growlithe in HG or Vulpix in SS)

Moon Stone
Johto: New Bark Town (Mom's Savings), Ruins of Alph (Bottom Right Ruins)
Kanto: Mt. Moon (Monday Nights Only), Tohjo Falls

Oval Stone
Johto: National Park (Come 1st in Bug Catching Contest)
Kanto: Rock Tunnel

Shiny Stone
Johto: National Park, National Park (Come 1st in Bug Catching Contest)
Kanto: Route 14 (PokéGear Phonecall)

Sun Stone
Johto: National Park (Come 1st in Bug Catching Contest)
Kanto: Route 13 (PokéGear Phonecall)

Thunder Stone
Johto: National Park (Come 1st in Bug Catching Contest), Route 38 (PokéGear Phonecall)
Kanto: Route 25 (Show Bill's Grandfather a Pichu)

Water Stone
Johto: National Park (Come 1st in Bug Catching Contest), Route 42 (PokéGear Phonecall)
Kanto: Route 25 (Show Bill's Grandfather a Marill in HG or a Staryu in SS), Seafoam Islands

Source