Quote Originally Posted by Kraleck View Post
Raw Power Move for Rock Types and a chance for Defense debuffs. Other than that, not much use. Why people use Stone Edge with an identically shaky accuracy, huge Type coverage, and identical Base Power is also beyond me...oh, wait...

Justification in a Move choice comes down to coverage, power, utility, and reliability. Iron Tail has poor coverage and reliability, but it definitely has usefulness from power and random-chance utility. I don't recommend it either, but it's still something to consider when Rock Types wall Poison and Steel/Rock Types also wall Dark. The high Defenses they have also means a few lucky Defense debuffs from Iron Tail will make their Trainer think twice about staying in.
It learns Earthquake, which hits basically the same things... Besides Ice types?