From Bulbanews, your community Pokémon newspaper.
To celebrate new Pokémon Shuffle theme
Pokémon Shuffle 3DS theme
To promote the new Pokémon Shuffle 3DS theme, players who check in to Pokémon Shuffle will receive 5 free Exp. Points x1.5 items.
The items can be obtained (once only) by checking in from June 1 to August 3, 2015.