First you have to open your bag and find the stone you want to evolve with. Then press it and choose "use". Then press the Pokemon you want to evolve.
Pokémon that had evolved with the use of a Thunder Stone are Raichu who wound up evolving from Pikachu, Jolteon who wound up evolving from Eevee and Eelektross who wound up evolving from Eelektrik.
some only evolve by using a evolving stone there's alot of those in pokemon platinum but you can only use the evolving stone on them when there a certain level or the best way train them faster cause them evolving doesn't make the, stronger just changes there look.
for evolving Pokemon
Did you use the dusk stone or litterally give it to it because you have to use the dusk stone not give and level up
The Leaf Stone may be used on Gloom, (evolving it to Vileplume,) Weepinbell, (evolving it to Victreebel,) and Exeggcute, (evolving it to Exeggutor,) in Pokemon Fire Red.
Underground or the ruins.
you use it on some water type Pokemon to evolve them. example:pikachu+thunder stone example:polywhirl+water stone example:evee+fire stone example:Roselia+sun Stone example:murkrow+dusk stone a ever stone prevents your Pokemon from evolving
Fire Stone Water Stone Thunderstone Leaf Stone Dusk Stone Sun Stone Moon Stone Dawn Stone
by getting a leaf stone and evolving a gloom
In Pokémon Black and White the Pokémon that evolved from the use of a Water Stone is Poliwrath after evolving from Poliwhirl, Cloyster after evolving from Shellder, Vaporeon after evolving from Eevee, Ludicolo after it has evolved from Lombre, Simipour after it has evolved from Panpour and Starmie after it has evolved from Staryu.
There Is No Level Restriction For Evolving Pikachu, You Must Use A Thunder Stone To Evolve One.
Growlithe evolves only with a Firestone, becareful I've heard rumors it no longer learns moves after evolving.