Animation seemed to have quite a bit of promise from the start, but the ending felt a bit rushed and the entire animation suffered because of it. The Gyarados looked good, was pretty well animated despite the fact that it was mainly tweens. Was a bit disappointed to see the sound cut out and the fairly lazy Pokeball catch effect on the Gyarados.
The Pokemon trainer looked okay to begin with as a silhouette, but I feel you may have gotten more out of the punchline if you had drawn a character in which you could display facial expression with. If you were to sacrifice character design by using a silhouette you would at least have been expected to make the Pokemon trainer animation flawless, but the walking loop seemed blocky and clunky.
Joke felt a bit too drawn out, the animation could have been done in 20-30 seconds and the punchline may have been stronger because of it.
Solid effort though.