Nintendo Insider writes:
That nine years has passed belies the addictive nature and endearing design of this somewhat fiendish puzzler, the gameplay having only seen minor tweaks in comparison to how it was, with players dragging and dropping Pokémon-faced pieces to match three or more. Doing so will create an attack that can damage a wild Pokémon leering at you on the top screen, soon allowing for its capture. The more combos that you can make, the more damage you do to the Pokémon. It’s that simple, really.