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What specifically do you need? I know I have a folder with a bunch of Golden Sun stuff on my computer somewhere (from a project that I abandoned a long time ago), though it might require me to search a bit to find it. I know there were animated battle sprites in there. I'm pretty sure there were some psynergy animations as well...Heck, let me try to dig it out. It's a pretty useful resource.
I'll see what I can put together with the resources I found on my computer. The unfortunate thing about the battle sprites from the GBA Golden Suns is that everything (idle stance, attacking, casting) is in two frames, which means they don't translate that well to RPG Maker 2003 battlesets, but I'll give it a try.