For Pokémon Trozei I came up with the idea of rounded Pokémon icons that I thought would be cute and easily identifiable.
I drew each and every Pokémon in icon form; rough outlines at first, colouring and polishing later.
For a while there my whole world was Pokémon icons.

Once approved by the Pokémon image checkers, the icons were turned into pixel art and put into the game as game pieces.

As well as being used in the original Pokémon Trozei game, the icons were also used in Pokémon Battle Trozei, and the recent Pokémon Shuffle for Android and iOS.