In case you didn't hear, Mega Man Battle Network 6 Cybeast Falzar and Cybeast Gregar are hitting the European Wii U Virtual Console later today. Both versions can be picked up for €6.99 / £6.29 a piece.
As per usual, you can acquire multiplayer-exclusive Battle Chips through the Comms menu. You'll need them to complete your Library. Unfortunately for die hard completionists, the Otenko and GunDelEX chips remain Japanese-exclusive.