Okay...So in Platinum there are many evolve items, like the Magmarizer or Protector, that
can be found in the wild, that you couldn't find in D/P. So here we go....
***Some are also found by catching Pokemon***

Dawn Stone---Male Kirlia, Female Snorunt---Mt Coronet, Route 225
Deepseascale---Clamperl to Gorebyss, trade---Wild Relicanth, Chinchou and Lanturn
(Post-Nat)
Deepseatooth---Clamperl to Huntail, trade---Wild Carvanha and Sharpedo (Post-Nat)
Dragon Scale---Seadra to Kingdra, trade---wild horsea, seadra, dratini and dragonair
(post-nat)
Dubious Disc---Porygon2 to PorygonZ, trade-Route 225
Dusk Stone---Murkrow, Misdreavus---Galactic warehouse, Victory Road
Electrizer---Electabuzz to Electivire, trade-Valley Windworks
Fire Stone-Growlithe, Vulpix, Eevee---Feugo Ironworks, Solaceon Ruins
Kings Rock---Poliwhril, Slowpoke, both trade---Wild Poliwhirl (Post-nat)
Leaf Stone---Gloom, Weepinbell, Exeggcute, Nuzleaf---Floaroma Meadow
Magmarizer---Magmar to Magmortar, trade---Route 214
Metal Coat---Onix, Scizor, both trade---Iron Island
Moon Stone---Nidorin(a)(o), Clefairy, Jigglypuff, Skitty---Underground
Oval Stone---Happiny to Chansey, held, lvl from 4am to 7.59pm---Lost Tower
Protector---Rhydon to Rhypherior, trade---Iron Island, Route 228
Razor Claw---Sneasel, held, lvl from 8pm to 3.59am---Route 224, Victory Road, Battle
Frontier
Razor Fang---Gligar, held, lvl from 8pm to 3.59am---Route 214, Battle Frontier
Reaper Cloth---Dusclops, trade---Acuity Lakefront(just grab when you go get Uxie)
Shiny Stone---Togetic, Roselia---Route 228, Iron Island
Sun Stone---Gloom, Sunkern--Underground
THunderstone---Pikachu, Eevee---Sunnyshore City
Up-Grade---Porygon to porygon2, trade---Eterna Galactic Building, Eterna City(prof. Oak
after visiting Pal Park)
Water Stone---Poliwhirl, Shellder, Staryu, Eevee, Lombre---Sunnyshore City