If you have a Riolu and feed them, then pull the food above their head, they'll bat at it trying to get it. <3 Oh, and furrets HATE it when you touch their tails. Starmie is really weird when it eats... o.O
It looks oh-so ticked off if you touch its wings, super depressed if you don't make a face at it, and has a ridiculously cheerful smile.
It uses all three of its heads to eat Pokepuffs (Though it oddly takes longer to finish one then a lot of other Pokemon do).
Its happy reaction and idle animation are adorable.
It gets impatient and starts snapping at you if you tease it with a Pokepuff. It also does this as its way of asking for a "high-five" if you hold the cursor on the screen without touching it.
It's the only fully evolved Dragon type that's very interesting to play with, as almost all of the others are extremely stoic, and most of them lack a unique idle animation and the ability to high five. I think someone on the development team has a soft spot for it...