Where is the metal coat in Black/White?

Question

I've been trying to evolve my scyther but I keep loosing him on the GTS to other trainers and I got the metal coat so long ago that I forgot where I found it.

Answer 1

>An item to be held by a Pokémon. It is a special metallic film that ups the power of Steel-type moves.

Route 13 / Twist Mountain: Winter Only

Evolves:

—>
Scyther —> Scizor
—>
Onix —> Steelix

Source: http://www.serebii.net/blackwhite/items.shtml
Source 2: http://www.serebii.net/itemdex/metalcoat.shtml

Hope this helps! •^-^•

Answer 2

Little eastern cave (winter only) in Twist Mountain.

Source: Bulbapedia/ Twist Mountain