Updated design:
Underwater Volcano Giant Tube Worm Mon
Yours is one of my favourite ideas, but I think that the fingers look
more suggestive now. Personally i think it would be cool if the fingers had those hammer shaped things that are on his head as fingertips.
I'm just going to comment on the ones that really caught my eye.
SubwayJ: Ahahahahaha that apple looks so smug.
Asylum_Rhapsody: I like his moustache, but he looks too much like the real thing for my tastes. Since he's based on the Flamboyant Cuttlefish maybe you could give him a little top hat and cane? (I'm a sucker for "wacky" pokemon though)
Fatecrashers: I love the anemone, he looks like he'd belong as a Chrono Trigger mini-boss. Your stuff looks extremely indebted to Akira Toriyama's style.
Chomz: Don't listen to him! The right! The riiiight!
LightlyLights: A phoenix stuck in tar is an awesome idea and really creative, I want to see what you do with it.
Sentret: He looks like a neopet! I think he'dl ook better with a different pose, as it is right not his gas mask isn't obvious enough.
Doran: I'm really sorry but your chimaera looks like he's got Bjorn Ulvaeus' hair.
Quanyalis: I'm really impressed with yours. The first picture you showed didn't look super impressive but now it's a really clever idea and one of my favourites.
KoA: I love that slug frog. Ther's absolutely nothing I can suggest for it.
RockPaperScizor: I laughed out loud at yours. He looks like he ate way too many "doughnuts" or something. He reminds me of a 3-stage pseudolegendary in the current state.
Yilx: I don't think that the two elements of fire and poison mesh as well as they should (why would the sun god be made out of toxic sludge???) but I love how excited he looks to be torching a ferrothorn. However, he looks waaayy too similar to Gali.
Collol: A vaporizer frog is easily the most creative entry I've seen so far. He's adorable.
Birkal: Another one of my favourites, I think that the bamboo should be either on fire or obviously dipped in poison in the final art to demonstrate that it's a fire/poison type.
KenZomg: Have you thuoght about making him into a composite pokemon since he's a tube worm? It would really differentiate him from the other snakelike pokemon if there aer a bunch of them attached to a rock throwing sludge bombs at unsuspecting Conkeldurrs.
ElementalPenguin: Great, reminds me of what Dragonite should've been, cute but badass. Why's there a spiral on his stomach? If you want to differentiate him from Cyclohm/Hydreigon, you should give him two main heads, put heads on his arms, and turn his tail into a head as well. Considerably more hydra-like (and creepier, if you like that sort of thing).
Ultimately, my favourite is still mos-quixote's. If he doesn't win I'll be suprised/disappointed, but any of these would be pretty great to see.