Pokémon + Nobuanga's Ambition, like other games, has got downloadable content which can only be obtained during set time. In this game, the downloads aren't Pokémon distributions but are in fact small episodes, detailing the story of various characters within the game.

Motonari & Motochika

US Distribution Time:
June 18th 2012 - December 31st 2012
Japanese Distribution Time:
March 17th 2012 onwards
Restrictions: None

Details
Motonari and Motochika, who get in the way of the main character at the start of the story, can become your friends. Strong with Grass and Water types, respectively, they are busho that can greatly help you.
Wandering Kabuki Performer: Keiji's Story

US Distribution Time: July 12th 2012 - December 31st 2012
Japanese Distribution Time:
March 24th 2012 - April 13th 2012
Restrictions: First Ending must be cleared

Details
The mysterious busho Keiji, who saves the main character many times on their journey. We will distribute his story/episode for a limited time between March 24th and April 13th.
Hideyoshi & Reshiram

US Distribution Time: August 17th 2012 - December 31st 2012
Japanese Distribution Time:
March 31st 2012 onwards
Restrictions: None

Details
This event features the legendary pokémon Reshiram and how it ties to the leader Hideyoshi, similar to Zekrom being with Nobunaga.
Okuni's Episode - A Date with Desti

US Distribution Time: July 27th 2012 - December 31st 2012
Japanese Distribution Time:
April 14th 2012 - May 11th 2012
Restrictions: First Ending must be cleared

Details
In the story, we learn how Okuni was made a leader by Princess No. It's labelled as a different kind of episode
Ranmaru's Episode - "A Fate Born of Beauty".

US Distribution Time:
July 2nd 2012 - December 31st 2012
Japanese Distribution Time:
May 11th 2012 - June 8th 2012
Restrictions: First Ending must be cleared

Details
In the story, we learn how Ranmaru wishes to beat the female Warlords to being the most beautiful Warlord