Wikia

Game events
Japan	Name: Sing Piplup	Method: Wi-Fi	Available: July 20th to August 9th
Japan	Name: Pokédex Guide Altaria	Method: Global Link	Available: November 18th, 2011 - November 30th
Japan	Name: Keldeo	Method: Movie	Available: June 23rd - August 31st
Japan	Name: Meloetta	Method: Movie	Available: July 14th - September 30th
United States	Name: Lucario	Method: Global Link	Available: January 12th - September 27th
United States	Name: Birthday Togekiss	Method: Global Link	Available: September 1st 2011 - August 30th

Event news

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September 24: The Mewtwo being distributed in Japan has Electro Ball as a move, normally Mewtwo cannot learn this move.
September 12: A Japanese Mewtwo event shown through a CoroCoro leak. It will be at level 70 and, as of yet, no special characteristics are known.
September 6: A Zoroark knowing Snarl announced to be distributed at Toys "R" Us stores.

--Interruption of updates--

Events