Earlier in January, a special event giving Japanese players a level 50 Serperior with the ability Contrary went live for Pokémon Omega Ruby and Alpha Sapphire. That same event has now gone live in North America and Europe.
To download the Serperior (which comes with the moveset Leaf Storm, Hold Back, Wring Out and Giga Drain), simply select “Mystery Gift” from the menu, choose “Receive Gift” and then “via Code.” The code that you will then need to enter is POKEMON497, which will net you the Pokémon (remember to pick it up in the Pokemon Center).
The ability Contrary makes stat changes have an opposite effect — for instance Leer would increase Serperior’s Defense by one stage but using Swords Dance would decrease’s its Attack by two stages.
Keep an eye out for two other event Pokemon coming later this year. Reckless Emboar will begin from January 29th from a code from the official site and Shell Armor Samurott will run from February 5th through a code in the Pokemon Trainer newsletter.