I'd like to see Pokemon based on the four suits as well as chess pieces. The four suits could each evolve from a single Pokemon that represents an unknown card. Depending on what stat is highest at Lv.X (HP, Atk/Sp.Atk, Def/Sp.Def, Speed) the Pokemon then evolves into one of the suits (Heart = HP, Diamond = Attack/Sp.Atk, Club = Def/Sp.Def, Spade = Speed). But, if the Pokemon's stats are all balanced at Lv.X then the Pokemon evolves into a "Joker" with equal stats across the board.
As for the chess pieces, you can have a Pawn as the first stage that evolves, like the suits, based on stats. Higher Attack/Speed means evolution into a Knight, Higher Defense/Sp.Def means evolution into a Rook, Higher Speed means evolution into a Bishop. From there, depending on gender, the Pokemon evolves into either a King or Queen, with the King having higher Defenses and HP and the Queen having higher Speed and Offenses.
As for the chess pieces, you can have a Pawn as the first stage that evolves, like the suits, based on stats. Higher Attack/Speed means evolution into a Knight, Higher Defense/Sp.Def means evolution into a Rook, Higher Speed means evolution into a Bishop. From there, depending on gender, the Pokemon evolves into either a King or Queen, with the King having higher Defenses and HP and the Queen having higher Speed and Offenses.