This section was taken directly from the official website.

In Pokémon Battle Trozei, you make matches of the same Pokémon from among all the Pokémon that fill your Trozei Box—the large field of Pokémon on the lower screen. The Pokémon that appears on the top screen is the wild Pokémon that you are facing in battle. Line up 3 Pokémon in a row to clear your Pokémon from the box and to reduce the HP of the wild Pokémon. When its HP reaches zero, you will be able to Trozei that Pokémon!

As time passes, the wild Pokémon will also lash out to attack you in return. When you’re attacked by a wild Pokémon, the Trozei Box will lose some of its energy. The wild Pokémon you face may even try to get in your way! If the Trozei Box’s energy reaches zero, it’s game over.

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