Octidian! Speaking of outdated things, Calimagma's also due for a redesign, and something I have in mind might even be a bit more drastic than the eventual Tweetune redesign.

But anyway, Octidian. Octidian's been a pretty long survivor as far as the generation goes, I think it and Calimagma were among the first I had ever designed, or at least sketched out in class or something years ago. I'm sure if you looked hard enough on my dA gallery there's a very early sketch of it somewhere, (Tho I guess I wouldn't count on it, it looks like I deleted it at some point) and I changed it up in this iteration because I felt like its rather lazy and blobby form was too easy for an octopus Pokemon, if that makes sense.