Fluidd

 Fluidd is a Polymorph from the planet Viscosia who had been illegally selling crude versions of the Omnitrix to various illegally-inclined aliens who wanted to have power.

Story
After the Omnitrix Blueprint Leak (OBL), Fluidd obtained a copy of a blueprint of the Omnitrix (reformatted) and decoded it and got to build a crude version of the reformatted Omnitrix. He then slightly modified the formula to be able to produce more Omnitrixes easily.

Ben knows about Fluidd's plan after fighting an alien with an Omnitrix where he got it from Fluidd at a very high price. After getting clues, he finds Fluidd producing new Omnitrixes at a warehouse in Galvan B. While Ben stopped the shipment, there are still many more aliens with their Omnitrixes, good or bad.

Fluidd's Omnitrix was removed from him after the capture, though he is said to return to fight Ben, said to be teaming up with Silverwork, a mysterious Biosovortian, and getting his crude Omnitrix back.

Fluidd's Omnitrix
Fluidd's Omnitrix looks exactly like Ben's reformatted Omnitrix. However, it was said to be made up of a more destructible metal, and could only make Fluidd transform into 13 aliens. These aliens are:
 * Aureate (Goldian)
 * Humongousaur (Vaxasaurian)
 * Crystalixan (a species which are very similar to that of Chromastone)
 * bull-like alien
 * Fourarms (Tetramand)
 * Articguana (Polar Manzardill)
 * Spitter (Spheroid)
 * Buzzshock (Megawhatt)
 * Airsnout
 * Echo Echo (Sonorosian)
 * snake-like alien (not Snakepit)
 * Smallfry
 * Shark-like alien