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piggy is the best as an overall eudemon because it has MD PD and PA.
piku is the best choice when it comes to defence eudemons becuase its main stats are PD and MD and has the highest max def stats.
PA wise piggy has the highest max stats with carli behind it. however carli's atk will grow faaster when composeing then a piggy's stat will so its all about how you want to attribute your char.