Serebii Note: TPCi working on a detective game. Partner with Pikachu. Details @ http://t.co/oV6DIIRILJ pic.twitter.com/cJ2o4kl4Tx

— Serebii.net (@SerebiiNet) October 28, 2013

They're working on a detective game featuring Pikachu as a partner. This game has an alleged development cycle of 2 years, with release expected in 2015. it's unclear when it began. A rare Pikachu is said to be the enemy within this game but they can't see people liking it. The game is to feature a special Blue Pikachu, which talks. The Pikachu is being controlled via motion capture and facial recognition.

Source: Serebii