You cannot get the TM Iron Tail in Red/Blue/Yellow. The move was introduced in Generation 2 with Gold/Silver/Crystal.
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After beating Jasmine, she will give you TM Iron Tail.
TM 23 - Iron Tail can be found on Iron Island.
TM 23 Iron Tail can be found in the Iron Mountain.
iron tail
Tm Iron Tail is near the village bridge but u have to use the dowsing machine in order to find it