A new Pokémon mobile title has been discovered called PokéLand. The game is a continuation of the Pokémon Rumble series and is currently in Alpha Testing on Android devices in Japan until June 9th, 2017. There are currently 134 Pokémon in the Alpha, 52 stages, and a Champion Tower that goes up to 15 floors. Connecting your Nintendo Account can also allow you to transfer data between devices and use your Mii in-game.
PokéLand requires an internet connection to play and all data from the Alpha will be deleted once the full game releases. A confirmed release date has not been given.