Love it! My favourite part is probably the first one with the Magic School Bus. I do think it probably should have come later in the short, but it is really well done. I like all the humour in this, I actually yelled out "No!" during the part with Pikachu lol :) I really enjoyed all the sound design and voice acting (although I do think your Shaggy could use some work haha). Nice character design (the prince's blue tongue was a nice touch), good animation all around.
Great work :)