Start/End Dates	2012-05-14 through 2012-07-05
Country	South Korea

Details

The official Korean website announced that Bolteuroseu (볼트로스) and Toneroseu (토네로스) would be distributed via the Korean Nintendo Wi-Fi Connection from May 14th, 2012 @ 10:00 until July 5th, 2012 @ 23:59. Like the Japanese distribution, the Pokémon were distributed to promote the two anime episodes Tornelos VS Voltolos VS Landlos! that aired on Tooniverse May 24th, 2012. Players of Pokémon Black could receive Bolteuroseu while players of Pokémon White could receive Toneroseu.


Source: http://pokemonkorea.co.kr/html/event/event_Off_view.asp?IDX=215