Krabby's boring, Eevee looks more like a stuffed toy than an animal, and Geodude isn't based on an animal.
Look, I really like your description. What you're describing sounds really cool.
But the way it's drawn.. the style of the drawing. The actual critter looks bad. If the green is supposed to be the exposed interior, or a depression in the armor, it's simply not indicated by a solid line. Put some depth in the armor.
If the triangles are supposed to resemble teeth, I say, make them teeth.. Make them fangs that stick out slightly from the body, so it's not just a round spiky thing with it's eyes and mouths pasted on.
I don't want rainbows and cuteness. I just want some texture.. something the looks like it could in some way be a real thing.. That's my beef with most of the modern lineups. They're extremely flat and dull, and half of their features look like flat stickers on a form.
Looking back at generation one, more of them suffer slightly from my complaints about the modern bunch, but in a simpler way... Like the weird markings on lickitungs body...
But anyway, here are a couple pokemon I like:
It's attractive, it's simple, it has texture, and no weird circles and triangles or flat lines anywhere.. Great pokemon, the evolutions are pretty decent looking too.
Look at this guy!.. He's a crab. He has a hard looking exoskeleton! Simple, yet effective. He also has a look on his face that says 'I'm a little crazy'
The circular areas below him risk looking flat, but have form, as indicated by the broken line on the left one. It's the shape of his hard body. It's not just some lines and circles for no reason. Not brilliant, but a good creature design.
Yes, seriously. It's simple.. It's beautiful. It's a hunk of rock that's alive! It's also cute and has stony biceps! No lines, weird flat geometry, just a chiseled form with eyes that have soul. (His evolution makes no sense to his third form though.. No sense at all. Let's not talk about that.)
Honestly thought I would find more I liked here, but having trouble.
"Too detailed."
"Too flat and undetailed."
"Too rough and asymmetrical.
"They just took my mom's dog and made it a Pokemon."
"Look at those flat, soulless eyes."
"What do those stupid-looking ears contribute to the design?"
"Those markings have no depth and that horn is pointless."
"Overdesigned piece of shit."
"Too simple."
"I hate cute bugs."