Scooby-Doo 2 - Monster Unleashed, from Rising Sun for the GBA, is likely based on the second Scooby-Doo movie. Gameplay probably featured classic Scooby-Doo elements such as solving puzzles, chasing monsters, and uncovering the mysteries behind the unleashed creatures.  The game most likely utilized side-scrolling or similar gameplay mechanics to translate the movie's adventures into a handheld format.

Scooby-Doo 2 - Monster Unleashed (E)(Rising Sun)

Scooby-Doo - The Motion Picture (S)(Independent)