you give it to a Pokemon that has trick the in a battle use trick then the other Pokemon has that item iron ect:in victory road the kadabra's have trick
It gives them +10 EV in defense
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Iron Island
TM 23 Iron Tail can be found in the Iron Mountain.
riolu
cherrim you can find it by battling a certain Pokemon trainer on iron island
Anywhere on Iron Island, just insert a ruby cartridge.