It is only in Pearl, Diamond and Platinum, not fire red or leaf green. If you meant a different mountain, then ask it right!
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in mount coronet
You could get it at Celadon City in the game corner for 4,000 coins.
You cant find it in Firered only leafgreen.
While it was possible to find missingno. in Red version, it is not possible to find it in FireRed.
Mt Coronet.