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 (southeast of Zapdos, hidden)

Repeatable
- Celadon Department Store ($2100)

Thunder Stone (Bulbapedia)

Answer 2

At the power plant

Source

Comments

thanks SBR

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Any time ^.^