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Although very smart and powerful in battle, they're childish by nature and love toys(building blocks, rubber duckies, etc), finding them fascinating, and in the wild will make their own "toys" (like making a little doll out of sticks and vines). Those who aren't so childish (Serious nature, older, etc) still act like a little ball of adorable and fun but in a mad scientist sort of way. (like the one in PokePark)
Taking care of them is like taking care of a gelatinous human child... er, who can reduce boulders to rubble. And is a tad more independant.