Rhydon got sketched out under the night to tuesday and Rhyperior today.

Second stage:
The hollow horns that was ontop the head of Rhyhorn have split into a soft ear and sharper horn in Rhydon's shape. Most of the heavier spikes along it's body is shed off as well to a harder shell like skin that draps it's body.
Only the spikes on the spine seem to have stayed but as a smaller version for better movement. Front leg claws grown longer and fingers than a soft stump that was there earlier.
Backlegs have gotten sturdier and can even hold the whole body upright in a stance for overlook of area or fighting. Rhydorn still prefer to move around on four tho even when it's front legs have turned into arms so a more monkey posture.
It's tail have grown insignificant longer and hard skin flaps works as armor along the tail as well. From having had a long body the ribcage and torso grown bit short for more upright build.

Third stage;
The soft ears are now fully gone, only a small hole can be found near the middle of it's horns base against the head. Seems to be like avian or old reptile genetics for that.
Rhyperior have two horns ontop it's head, both massive and long, while the one ontop it's nose is the biggest, they seem to grind the horns against mineral surfaces to keep both shiny and sharp for usage.

The skinflaps that worked as light armor in earlier stage have grown denser as well and less moveable where it is the thickest and shell like looking. Can now be ranked as metal class of armor.
Where it is toughest it is also more yellowish or even orange tone on the body.
The long tail have grown thinner but still have great strenght in it's swing and now a heavy clump of bones and keratine to crush other critters bone.
Arms have grown longer, the forearm mostly with hold jabbing parts jutting out from the side of the elbow. Due to it's large arms it, the claws that was once sharp at the end of the hands are now duller for constanst movement but dont let that fool you, those "claws" can still make nasty wounds if against soft skin in a swing.
The torso more thicker and protected along the sides and mostly over the back with the harder scales. Tho Rhyperior may loose heavily in agility it can still be a brute force if close enough or put into a corner.

Speed sketches
Felt like I needed to write a description this time over the changes.