This is a reverse-chronological list of event Pokémon distributions that were given away via Wi-Fi to Japanese language Pokémon games in Generation V. Wi-Fi distributions for Japanese games began at midnight on the start of date according to JST and ended at midnight at the end of the day of the end date according to JST. These Pokémon were also available at Download Stations and Nintendo Zones.
List of event Pokémon
Bulbanews has multiple articles related to this subject:
This Meowth is based on Team Rocket's Meowth and was distributed over Wi-Fi because of its involvement in the Best Wishes: Episode N season of the anime. It was available from December 7, 2012 to January 10, 2013.
This Genesect was distributed over Wi-Fi from August 11 to September 14, 2012. It was also distributed from August 11 to 21, 2012 as part of the Pokémon Center Summer Festival (Japanese: ポケモンセンターなつまつり) held at the Tobu Department store.
The following event Pokémon were distributed randomly as Eggs. The one obtained is based on certain information about the player, such as ID number. They are based on the Pidove, Axew, and Pansage belonging to Ash, Iris, and Cilan, respectively. Each of the three has an IV of 31 in one stat: Attack for Pidove and Pansage, and Speed for Axew. All other IVs always random; they are not dependent on information like ID number. These Pokémon can be Shiny if the eggs are traded to another game.