Not bad for a short animation. However there are a few things that would make this better.
-Adding some sound effects when the Diglet slides in and when the Snorlax spews rainbows would make the movie less silent and overall less empty.
-Having the Snorlax exhibit some movement (wobbling, arm movement etc...) while shooting the rainbow out would add to the animation and make it seem more fluid.
-Having the Pokemon in the top left move up and down slightly as the animation goes on will prevent it from looking like its attached to the wall and more as a character.
-Having an end screen with a "Repeat Movie?" button will make the animation have a clear end, and prevent it from looping continuously.

A few tweaks and extra sound effects and this animation will be a bit better.
Hopefully the next one will be even better. :P

you need a repeat button,

kinda weird, art is good like the animation

of all sounds, the burp was the one you should have put some effort in finding one

At least there was some animation I suppose!

Pretty short but cool.