A new check-in addition for free to play 3DS Pokémon game, Pokémon Shuffle, has been released today. The addition gives you the chance to earn a Mega Lucationite stone by playing through the stage in the aim to get the best score and rank within the top 20,000 when the results are posted.
You can play this stage for a week with the results being posted on the 23rd of March. Every player who attempts the stage will be given a jewel for their efforts. Currently this is the only way to get a Lucarionite Mega Stone.