Iron Tail is not a TM in Pokémon X and Y.
If you want a certain Pokémon to learn the move, it has to be bred from a Pokémon that knows Iron Tail and can get it as an egg-move. Pikachu can't learn it through this method, for example, the only way is by transferring one that knows the move from a Generation V game (Pokémon Black, White, Black 2 and White 2) using the Poké Transporter and Pokémon Bank apps for the Nintendo 3DS.
Iron Tail isn't a TM in the game.
I don't think any TM moves were removed from Unova for Kalos in Pokemon X and Pokemon Y, they areN just in different places.
x
It's in a pokeball.
Dive is no longer a TM or a HM in Pokemon X/Y. You'll have to have a Pokemon learn it naturally.
battle island
You can get the TM Rock Smash from a lady near the Poké Center in Ambrette Town.
TM81 (X-Scissor) is at Route 7 in the grass.
The moves Eevee can use are Growl, Tail Whip, Sand Attack, Helping Hand, Tackle, Growl, Quick Attack, Baby-Doll Eyes, Swift, Covet, Refresh, Bite, Charm, Take Down, Double-Edge, Baton Pass, Trump Card and Last Resort.
You have to buy it in the Battle Frontier Shop for 64 B.P.
That is i think flamethrower thunder x sizzor and psychic blizzard and overheat hope this does you good :)
Pikachu's move set in Pokemon X and Y includes Growl, ThunderShock, Tail Whip, and Thunder Wave.