Easy way to rip GBA sprites without Visual Boy Advance?

[Fawfulthegreat64]

I recently noticed that in the beta version of The SpongeBob Movie (GBA), one of the bosses has a different appearance. I was able to get a ROM of this beta version, but the title screen won't load in Visual Boy Advance. It loads in No$GBA and I can get to the boss via passwords, but I am not sure how to actually rip the sprites. Some frames are obscured by foreground objects during the boss battle, and the player sprites also overlap the boss at times. I would like to get these beta boss sprites on the site but I'm just not sure how to go about doing that. Can someone help?