Start/End Dates	2012-11-08 through 2013-07-31
Country	South Korea

Details

A special Godibomi (고디보미) was available to be unlocked for those that entered a unique code that could be found in the Pocket Monsters Black 2 White 2 Official National PokéDex Completion Guide (포켓몬스터 블랙 2 · 화이트 2 속성공략가이드). The guide book went on sale on November 8th, 2012. The Godibomi (고디보미) was available on the Korean Dream World and it has the hidden ability Shadow Tag.

Source: http://pokemonkorea.co.kr/html/event/event_On_view.asp?idx=250