Rather than update the older post, I'm just making a new post for this. All of WaveMan's battle sprites (that I intended to use) are complete.
Making everything was very difficult but I am satisfied with my work. I might even make a tutorial on this because it's so effective. The trick is to make it in parts, obviously. Then it's easier to assemble everything at the end with an image-editing program with layers. The overall process is extremely time-consuming and making a fully custom sprite sheet would take a lot of patience considering consistency errors like proportions and size will become cumbersome.