When you find out that he or she has it's own problems,please feel free to comment.
Dr. Shrunk an axolotl, which is a small, central American breed of salamander. Dr. Shrunk allows your character to express emotions in the game.
I don't think there is a code for that, unfortunately. Since Dr. Shrunk is programmed into the game to come whenever he pleases, AR cannot change it. :(
Dr. shrunk
Frillard is a crazy lizard who appears at Dr. Shrunk's marquee in the city, on rare occasions. Frillard can explain emotions that Dr. Shrunk can't, such as bashfulness, sleepiness and thought. If you look real carefully on the signs outside of the marquee, you can see Frillard's photo next to Dr. Shrunk's.
Not every week, but every other week or so. It varies for each game.
Speak to Booker (as I recall) and ask him about anything new; he should mention a passing NPC such as Shrunk, Sahara, Wendell, etc. Dr. Shrunk will only visit through the week, never on weekends.
He allows you to use emotions in game.
He is a frilled lizard.
Frillard, from Animal Crossing City Folk, appears at the Marquee (the theater) in the City on occasion, in place of Dr. Shrunk, the crazy psychiatrist. Frillard knows emotes unknown to Shrunk the shrink. Look for the zany yellow lizard!
There doesn't seem to be a way; so you're stuck with Dr. Shrunk!
You get emotions from speaking to Dr. Shrunk. He comes by on one random day during the week.
On AC: New Leaf, when you get the joke book from Dr Shrunk, it creates an animal face button at the bottom of your screen. Touching it opens the joke book, which lets you display any emotions you've learned from hearing Shrunk's jokes.