Codes are valid until November 30, 2015
The codes for Serperior, Emboar, and Samurott in Pokémon Omega Ruby and Alpha Sapphire are now all redeemable. Just head into the Mystery Gift option and choose “receive via code,” then type in POKEMON497, POKEMON500, and POKEMON503, respectively.
These Pokémon are packing hidden abilities (Contrary, Reckless, and Shell Armor), so it’s worth setting aside a couple of minutes to nab them before leaving ’em inside a box, unloved.
When this distribution event was announced, I asked which of the three monsters was best, and things got weird. I expect that to happen in all Pokémon posts these days. Or all posts, really.