To promote the airing of the 2nd Pocket Monsters Movie - The Birth of Lugia (루기아의 탄생) on Video on Demand (VOD) services in South Korea, from May 2nd, 2016 until July 31st, 2016, Korean players of Pokémon Omega Ruby and Alpha Sapphire will be able to enter a serial code to unlock Articuno, Zapdos and Moltres. The serial codes for these Pokémon were revealed as part of the broadcast on the different VOD services.

Articuno - Cable TV VOD

The serial code for Articuno was revealed on Cable TV VOD and it is: POKEMON144. Articuno is Level 70, has the Ability: Snow Cloak and knows the moves: Freeze-Dry, Ice Beam, Hail and Reflect.

Zapdos - olleh TV

The serial code for Zapdos was revealed on olleh TV and it is: OLLEHTVPOKEMON. Zapdos is Level 70, has the Ability: Static and knows the moves: Discharge, Thunder Shock, Rain Dance and Agility.

Moltres - LG U+TV

The serial code for Moltres was revealed on LG U+TV and it is: MOVIE2. Moltres is Level 70, has the Ability: Flame Body and knows the moves: Sky Attack, Heat Wave, Sunny Day and Safe Guard.

Sources: http://pokemonkorea.co.kr/?inc=news-news_view&IDX=10633 and https://story.kakao.com/ch/pokemonkorea/EEd7TiedU70