This being Lemonice, I'm pretty sure that's a pokemon.

But, I don't know enough about pokemon these days to say which one.

I think that's either Steelix or Aggron. I'd need to see more of the body to be sure.

My first thought was Rhyhorn, but the head doesn't match any Pokemon that I can remember. Could be a highly stylized Mega Aggron, though.

Though it does remind me of Ultraman's Gomora...

If any, then it's *highly* stylized. The head shape reminds me vaguely of Aggron or a bit more of Druddigon, but the color doesn't fit for the latter. And near the top middle, that looks like the tip of a blade, claw or wing, which wouldn't really match either of the two. Is there anything in the source?

I thought it was a Gravios, haha

Very late to the discussion, but that is an Albinoss. It appears in Tenco's Story.