Love that Shaymin
I’ve moved on from Pokemon Shuffle (Pokemon Rumble World is my jam now on 3DS), but it still continues to be supported by Nintendo in the form of the occasional special event. To celebrate four million downloads, they’ve launched the Shaymin battle.
After the first completion you’ll earn 1,000 coins, and a “Complexity -1 item.” It’ll run until June 15th, so you have a while.
Pokemon Shuffle [Serebii]