Horrible learn how to make flash take a class of it in school.
Why flash?
It's an animation not a flash.
Flash is better for animations because it is smoother and less eye-soring.
Also, a lot of people who animate use it, unless they can't afford it, and even then, they use programs like Easytoon.
I'm using Animations Shop (you get it with Photoshop i think).
That was my first programm to make animations and my only programm to make animations with. I don't like the newer ones.
It's like Paint. I'm only using it, no other (sometimes for skins i'm using Photoshop but only for the effects).