Rhydon through the ages....
Green:
Oh sweet lord what is wrong with it!? It's all short, and those eyes.... this is what sprites look like in hell.
RB:
Much better. They've gotten rid of the freakishy large eyes.
Yellow:
Pretty cool, looks like it's about to run you down.
Gold:
It's about to charge!
Silver:
Meh.
Crystal:
The spinning drill is pure win. And note that from here on Rhydon is a lot lighter in colour.
R/S:
Not the greatest sprite ever.
FR/LG:
Looks cool, but pretty generic as Rhydon goes.
Emerald:
Emerald's animations suck. I have no idea why it's changing size like that.
D/P:
Nice and badass here.
Platinum:
Would look very cool, but I notice its horn is abnormally large, larger than all precedding sprites. I much prefer the female, with the smaller horn:
HG/SS:
A pretty poor sprite I have to say. The colouring is a little off and he looks mishapen.
Gold, Crystal, and female Platinum are probably the best Rhydon sprites.