Go to Bill's grandpa in Pokemon silver ( he is in a house in Cerulean Cape)
Show him oddish, then he will ask to see a star Pokemon. It is staryu. Use the super rod in Cerulean city gym, and catch staryu at night only. Show It to Bill's Grandpa, and he will give you a water stone. It also works in silver.
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The thunder stone is used to evolve electric types of Pokémon such as Pikachu. You can get one in Gold version in the Celadon City department store.
Eevee evolves into Vaporeon (the water version) with a water stone.
You need a water stone..
In order of how he wants to see them (based on Heart Gold and Soul Silver): Gold/Heart Gold: Oddish - Leaf Stone Growlithe - Fire Stone Pichu - Thunderstone Jigglypuff - Everstone Marill - Water Stone Silver/Soul Silver: Lickitung - Everstone Oddish - Leaf Stone Staryu - Water Stone Vulpix - Fire Stone Pichu - Thunderstone
Yes, use a water stone.