The official Pokémon website has announced that people that participate in the Pokémon League events can get access to a special Scizor that knows Steel Wing and Pursuit. Below are the full details.

Cool Pokémon for Pokémon League Players!

There are now even more reasons to start playing in your local Pokémon League—cool Pokémon!

Participate in Pokémon League events to get special access to awesome Pokémon in the Pokémon Global Link! Right now, if you play at a Pokémon League event during the ongoing Aspertia Gym Season, you'll qualify to get a tough Scizor with a great set of moves, including Steel Wing and Pursuit. Then, between December 20, 2012, and February 21, 2013, visit the Pokémon Global Link to get Scizor. Be sure to visit during later seasons for more tough Pokémon!

All you need is a Pokémon Trainer Club account and a copy of Pokémon Black Version 2, Pokémon White Version 2, Pokémon Black Version, or Pokémon White Version registered at the Pokémon Global Link.

Source: http://www.pokemon.com/us/pokemon-news/op_2012_league_pokemon_distribution-2012-11-13/