TM24 is given by Lt Surge after his defeat at the Vermilion City gym.
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That TM is in silph co.
Power plant
I don't believe its a TM in silver you can get one from red,blue or yellow.
You cannot get the TM Iron Tail in Red/Blue/Yellow. The move was introduced in Generation 2 with Gold/Silver/Crystal.
in celadon city in the gamecorner basement