Garu-Garu was created by Belvera to help her take over the world. It was attacked by Fairy Mothra, but it managed to escape. It transported Belvera to Desghidorah's tomb, and was eventually destroyed by Fairy Mothra.
Garu-Garu was rebuilt to help Belvera again, but it was only used for transport. It was modified with cannons, and fought Fairy Mothra once before escaping with Belvera.
Garu-Garu 3 was built with more advanced weaponry, but it was destroyed by Grand King Ghidorah when it was pulled into his dome.