Scooby-Doo! and Sonic 2

Sonic's ready to prove himself as a hero in Green Hills, and his chance arrives when Tom and Maddie head off to Daphne and Fred's wedding in Hawaii cause of Robotnik coming back with a partner named Knuckles, the two being after a magic powerful emerald. Now, Scooby, Shaggy, Sonic, and newcomer Tails must get to the emerald before it's too late!