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Personally, I think the most interesting thing about Lucario are its reproductive habits. Every other pokemon hatches from an egg, but Lucario just shows up in your party unannounced, permanently replacing one of your existing pok[emon even if you had an available party slot. Nobody, of course, wants any other pokemon as much as they want a Lucario, and more time you spend battling with your new symbiote, the more you'll find yourself enamored with its superior beauty, power and vast, vast knowledge. Forever.