In order to complete your National Dex in Pokémon Brilliant Diamond and Shining Pearl, you're going to need to scour Sinnoh for some special items.
Evolution Stones are a type of Stone that aid in the evolution of certain Pokémon -- a classic example from the anime of this is Clefairy needing a Moon Stone to evolve into Clefable.
These stones aren't necessarily plentiful, but you'll be able to find at least one of each in Sinnoh. For more, you're going to need to rely on RNG luck.
Where to find Evolution Stones in Pokémon Brilliant Diamond and Shining Pearl
Note that the Evolution Stones will only spawn in Grand Underground digs once you've unlocked the National Dex.
Dusk, Dawn, and Shiny Stones are not found while digging, but you'll find enough of each to cover one copy of each Pokémon that requires them.
Found
Lost Tower, 2F
Effect
Evolve Happiny into Chansey, during the day.
Found
Team Galactic HQ
Victory Road B1F
Effect
Evolve Murkrow into Honchkrow
Evolve Misdreavus into Mismagius.
Found
Route 228, near the Pokémon Rangers
Iron Island B3F - take the right staircase down
Effect
Evolve Roselia into Roserade, during the day with high Friendship
Evolve Togepi into Togetic, with high Friendship
Found
Route 225. Use Rock Climb in the northern part of the route.
Mt. Coronet, 1F. Use Surf to cross the southernmost body of water.
Effect
Evolve a male Kirlia into Gallade
Evolve a female Snorunt into Froslass
Found
Route 213. Use Surf in the south, and work your way to the very end.
Dig in the Grand Underground
Effect
Evolve Poliwhirl into Poliwrath
Evolve Shellder into Cloyster
Evolve Staryu into Starmie
Evolve Eevee into Vaporeon
Evolve Lombre into Ludicolo
Found
Fuego Ironworks, in the far north-east.
Dig in the Grand Underground
Effect
Evolve Vulpix into Ninetales
Evolve Growlithe into Arcanine
Evolve Eevee into Flareon
Found
Sunyshore City, behind the lighthouse.
Dig in the Grand Underground
Effect
Evolve Pikachu into Raichu
Evolve Eevee into Jolteon
Found
Floaroma Meadow. Enter from the Fuego Ironworks.
Dig in the Grand Underground
Effect
Evolve Gloom into Vileplume
Evolve Weepinbell into Victreebel
Evolve Exeggcute into Exeggutor
Evolve Nuzleaf into Shiftry
Found
As a held item on wild Clefairy, Clefable, Jigglypuff, Wigglytuff, Cleffa & Igglybuff.
Dig in the Grand Underground
Effect
Evolve Nidorina into Nidoqueen
Evolve Nidorino into Nidoking
Evolve Clefairy into Clefable
Evolve Jigglypuff into Wigglytuff
Evolve Skitty into Delcatty
Found
As a held item on wild Solrock.
Dig in the Grand Underground
Effect
Evolve Gloom into Bellossom
Evolve Sunkern into Sunflora
From Rock Smash to Cut, Strength to Fly, Hidden Moves are crucial in unlocking your adventure. Here's where to find all the HMs in Pokémon Brilliant Diamond and Shining Pearl.
