I voted Yilx.
Simply because of the designs, I like it best. And it looks like a Black Mage from Final Fantasy - which is, IMO, a GOOD thing. Why? Black Mages are known for being able to hit with all sorts of moves, not to mention they look epic.
That said, I wouldn't mind seeing any of these win.
For all haters:
CyzirVisheen's design is a giant lanturn which looks more like a bell than anything. It has a lighthouse feel crossed with something which makes it look like it can attack back. Plus, the fish can be used similar to a fist, so we can justify a lot.
Cartoons! has a fairly original design: and it isn't pre-typed. It doesn't look like it can use any move over another, which is a perfect attitude to use, as it means we can justify, if it really becomes something you wish to do, the use of Move X.
Yilx's design is cute, yet we all agree it looks fun. If you don't want to see it because we have a squid, treat it like a friendly jellyfish. Or remind yourself we have so many bird/ fish Pokemon that it shouldn't matter anymore.
aragornbird's prawn is fun, and it's obviously the best design overall, as we still love it even though it was one of the first to be submitted and it still is going strong.
Finally, Pokemon don't need to make sense. Stop trying to justify or make things more real: if that's what you want, don't play. Animals shouldn't be able to electrocute anything with it's own power, nor shoot fire from their mouths. But we accept it as a fact. Doug had a brilliant design with his beaver, but Cyzir's isn't even an animal or an inanimate object, but something in between, and we still liked both. Stop using the excuse "not Pokemon-enough" or "doesn't seem real" - you are not, nor will ever be, Satoshi Tajiri, so those arguments hold no weight.