In Generation III (Ruby, Sapphire, Emerald, Fire Red, Leaf Green), the only Pokemon that evolve with a Thunderstone are: Eevee, which evolves into Jolteon; and Pikachu, which evolves into Raichu.
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Tynamo evolves into Eelektrik starting at level 39. Eelektrik evolves into Eelektross by using a Thunderstone.
Pikachu ONLY evolves into a Raichu when you give it a Thunderstone.
so if you want to elvolve pichu then you have to get its happyness up and to check it you go to the house in golden rod city but anyways once ots happyness is up then you can elvolve it with a thunderstone.
It evolves by happiness
In Pokémon Ruby, Magikarp will evolve into Gyarados at Level 20.