A few things:
1. Reminder that Hoopa is available via the Nintendo Zone at participating McDonald's in the US, and lasts until December 23rd.
2. Pokemon Picross is now out in the eShop, it follows a similar model to Pokemon Shuffle in that it's free to play as long as you don't mind waiting for timers. Filling in a square costs 1 of your energy (default max 100), and it takes 1 minute to recharge 1 energy. Picrites (obtainable by completing puzzles, doing tasks, and purchasing them in the eShop) can be used to reset timers, increase your max energy reserves, and open the next area.