it can't but it learns dragon rush at level 55 which is a good alternative or draco meteor from the move tutor if you'd prefer that
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Gyarados will learn Aqua Tail at Level 35.
pikachu learn iron tail at lvl 60
palkia will learn water pulse at level10 ancient power level 20 dragon claw at level 30 spacial rend at 40 heal block 50 earth power 60 slash 70 aqua tail 80 and aura sphere 90
Snivy and its evolutions have no level-up moves of types other than Normal or Grass. It can learn Aerial Ace (Flying) and Dragon Tail (Dragon) via TM, but that still leaves it with no moves that aren't resisted by Steel. In Black 2 and White 2, it gets Aqua Tail (Water) to help with the Steel problem. The type combination Water/Grass/Flying/Dragon can hit everything at least neutrally.
Yes, Ninetales can learn Iron Tail (TM23).