Where can I find a Thunderstone in FireRed?

Question

I need one to evolve my Pikachu.

Answer 1

Non-repeatable
- Power Plant (Northeast room)
- Power Plant (Hidden item one tile south and three east of Zapdos)

Repeatable
- Celadon Department Store (4F; $2100)

Thunder Stone (Bulbapedia)

Answer 2

At the power plant

Source

Comments

thanks SBR

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Any time ^.^