Start/End Dates	2015-10-09 through 2015-10-11
Country	South Korea

Details

The LET CHU GO DDP! event was held at Dongdaemun Design Plaza in Seoul, South Korea from October 7th, 2015 until October 11th, 2015. Four different events took place as part of the festivities. The LET CHU GO DDP! event was similar in style to the Great Pikachu Outbreak! event that took place in Japan and had mascot Pikachu's doing parades.

Event 1: Special performances by Gamblerz (갬블러크루) took place at 13:30 to 14:00, 15:00 to 15:35 and 16:15 to 16:45 on Saturday October 10th, 2015.
Event 2: A Pikachu sun hat was distributed.
Event 3: An alternate-colored Pikachu was distributed to players of Pokémon Omega Ruby and Alpha Sapphire from October 9th, 2015 until October 11th, 2015 from 11:00 to 19:00 each day. It is Level 10 and knows the moves Teeter Dance, Play Nice, Tail Whip and Nuzzle, has the ability Static and is holding a Persim Berry.
Event 4: A Pokémon Store was open from October 7th, 2015 until October 11th, 2015 and will sell official Pokémon Center merchandise.


Source: http://pokemonkorea.co.kr/?inc=news-news_view&IDX=10500