I did normal gts and got a pikachu at level 4 so I want to find iron tail to make it an almost ash's pikachu clone. so it comes down to this: is there an iron tail tm in Pokemon or is there a move tutor or at LEAST does it learn it naturally?
^ The Marriland guide; it's the first house in Lentimas town, left of the Poke Centre, talk to the old man with the moustache.
Also, Pikachu can only learn Iron Tail via tutoring, just in case you were wondering if it could be bred to learn that move.
Source: (Pikachu entry on Bulbapedia)
There is no TM.
Move Tutor. Lentimas town, 6 Blue Shards.
And Pikachu does not learn it by level-up.