I have made a tutorial for creating and inserting gbafe battle animations.
It is divided into sections detailing tools needed, colour usage, drawing, animating, scripting, and inserting animations with febuilder, with illustrations as seemed appropriate, and hopefully comprehensive and easy to follow.
You can find it at fe-battle-animations.neocities.org.
It should be more or less complete at this point, but if you find it lacking in some manner or would like to see further additions or improvements, i'm open to suggestions.