The History of Godzilla vs. Megaguirus (2000)
Sources
Brian Solomon's "Godzilla FAQ"
David Kalat's, "A Critical History and Filmography of Toho's Godzilla Series".
https://wikizilla.org
https://www.tohokingdom.com/
You can purchase or rent "Godzilla vs. Megaguirus" at https://www.amazon.com.