You find the thunder stone in Celadon Mall level 4, wise man gifts.
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You can buy them on the fourth floor of the Celadon Department Store
Moonstone everstone sun stone water stone fire stone leaf stone and thunder stone
you can get the leaf stone, fire stone, and thunder stone at the big department store in celadon city. you get eevee in the back on the Pokemon mansion.
sunkern into sunflora and gloom into bellossom
You can trade shards for stones from a guy on Route 124: blue for water, red for fire, green for leaf, and yellow for thunder. Water Stone: Abandoned ship Fire Stone: Fiery Path Leaf Stone: Route 119 Moon Stone: Meteor Falls Sun Stone: Mossdeep Space Center