hmmm, funny, yet too short.
maybe try adding more of a story into it, like HOW they ended up on this island.
you mentioned radiotube, but you should also show how he got to sink his ship there.
on addition, you should also show a benny-hill STYLE chase between chalk and ivyasaur, it would be much more funny than a simple -one-liner.
other than that, it was good.