Step 1:Catch pikachu in viridian forest. Step 2:Next you go to celadon city department store on the fourth floor. Step 3:Talk to the man at the back and buy a thunder stone. Step 4:Use the thunder stone on pikachu and ta da you have a raichu and here's an extra get a girl and boy pikachu two thunderstones evolve them both go to 4 island(after you beat the elite 4 and get the rainbow pass)put them in the daycare together and they'll have an egg hatch it by getting a slugma and putting it close to the egg in your bag then ride your bike around and soon it will hatch and you'll get a pichu Hope this helps emilytheanswerwizard99
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- Thundershock - Tailwhip - Quick Attack - Thunderbolt
The Pokémon that evolve via the Thunderstone are Pikachu which evolves into Raichu and Eevee which evolves into Jolteon.
Raichu will not learn thunder.... but pikachu can learn it at level 45
In Sapphire, there is Electrike, Manectric, Pikachu, Pichu(breeding), Raichu(evolve), Voltorb, Electrode, Plusle, Minun, Magnemite, Magneton, Chinchou, Lanturn, Zapdos(trade from FireRed or LeafGreen), and Jolteon(trade from FireRed and LeafGreen).
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.