If you go to the game corner in Celadon city,you can buy alot of coins, ( which cost ALOT of money ) then go outside the little house next door, talk to the third(or second) person in the room, then one of the TM's are thunderbolt. also, on one of the people you can get a Porygon.
P.S, i think the amount of coins you need to get the TM is 4500.
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It can learn Thunderbolt through TM.
- Thundershock - Tailwhip - Quick Attack - Thunderbolt
I think you are able to buy the TM for this at celdon city games corner for around £4,000 ?
the game corner exchange in celadon city.
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.