Not that good...
You may need some help with motion and shape tweening and stuff like that...I'm glad you compressed your audio...but you could also have compressed your graffics (which can be compressed the some way asaudio...but don't over compress)... If you need any help just IM me or something...
Hmm
This was sort of boring. Put in voices next time. Or something.
HOW STUPID
Not worth watching, not worth continueing
i couldn't finish it.
the animation was too choppy, the music often had a radio cassete recorded effect to it, and you were using classic and advance sprites for sonic characters (you also used metal, AND mecha sonic sprites for the same character) you need to be consistant with sprite images so that the characters all have the same style and don't switch between old and new. the same goes for stand still images for different characters (can't have sonic in GBA spite form while knuckles is in sega genesis sprite form, it just doesnt look right). not to mention you didnt check your sprite images well enough to make sure that you got all of the white background erased. right after vegito fired his energy blast was when i stopped.
by the way, when eggman stole the master emerald, you called it the chaos emerald. really big mistake, any sonic animator has to know the difference between the master emerald and the chaos emeralds.
work on your animation skills and you'll do better in the future
Meh.
Off the subject, NEVER use yellow on white, it's impossible to read.