at the pokeathon, but only on certain days
Thunder stone is not a TM, it's an item to evolve things like pikachu.
use a thunder stone on eevee
moon stone
At the Pokethlon Dome or at the Bug Catching Contest
You have to get a pikachu first then give it a thunder stone, or you can train it to evolve
You can get the moon stone in the cave when you are when you are heading to the Kanto Reigon.
by mt. moon in the white fence on monday clefairy will do a dance and leave a moon stone behind
you have to evolve a skitty with a moon stone
You get it from Billy's Grandfather on route 25 after showing him some pokemon.
actually pikachu only evolves when you use the thunder stone on it.
After you battle and beat the gym
cleffairy and jigglypuff