As the name implies, Pokémon Rumble Rush continues the Pokémon Rumble series and tasks you with battling toy Pokémon. As you adventure around uncharted islands you will gain new Pokémon and "Gears", which your Pokémon can equip to become more powerful.
The game is free-to-start and has micro transactions, like many free to play games. The game is available now in Australia on Google Play (iOS release to follow soon), with a release in other regions said to be happening "soon". We'll keep you updated as it rolls out elsewhere!