Pretty sure I saw it some time in the early 2010s, it was a Scooby Doo Movie that was in color and in English, I can’t remember if I saw it on TV or not, and I might be mashing multiple episodes together, but it had some dragons, it was in China, there was a evil samuri dude and a scene where Scooby and Shaggy became Sumo Wrestlers.

I am sure it is not an episode from Mystery Inc. or What’s New Scooby Doo as I have recently rewatched them.