Art and stats have very little to do with each other. In fact, art has very little to do with anything.
Why is Lucario a "Steel" type?
Why is Mamoswine (a big elephant, basically) so fast?
Why isn't Magnezone levitating?
Why is Flygon not Flying?
How the hell is Garchomp (a shark) Dragon/Ground?!?!
Why is Celebi/Jirachi/Uxie so damn bulky?
Why is Paras/Parasect (a crab) considered Bug/Grass and not Water?
Sudowoodo. (no explanation necessary)
Please show me the Ice or Psychic "look" in Jynx.
How does Togetic (a little 7-pound bird) have such high defenses?
Don't actually answer any of these questions. I could add a million more. Yes, there are many pokemon whose artwork supports its typing, stats, and moves. But there are MANY that have little to no correlation. I know everyone will continue to judge the artwork based on whether it supports our Grass/Fire poke and the presumed build. But, I really wish people could just vote on a cool design and not worry about the other stuff. It's obvious that Nintendo does not require any kind of direct correlation -- Why should we?
I'm going to answer your questions because it seemed like you were trying to prove a point, but I don't see it because most of those questions actually have easy explanations to them that actually show how the design of a Pokemon influences how they are played in the game.
Why is Lucario a "Steel" type?
Ever seen the Lucario movie? By the personality type of Lucario, the steel basically is a figure of "valor" and a loyal servant knight, and while it probably can be seen as just part psychic with his aura, the blue color added to its body suggests cold/hard material a lot like steel. Psychic and Dark also tend to be the opposite of valorous/loyal like, so steel fits it well.
Why is Mamoswine (a big elephant, basically) so fast?
Elephants can easily outrun a man.
Why isn't Magnezone levitating?
It gets a levitate move upon evolution.
Why is Flygon not Flying?
It's a dragon, and dragons can fly.
How the hell is Garchomp (a shark) Dragon/Ground?!?!
It's based on a land shark. A shark that lives in the sand and that can fly as fast as a jet plane.
Why is Celebi/Jirachi/Uxie so damn bulky?
They're all based on mythical, legendary Pokemon, that have been around longer than most regular Pokemon.
Why is Paras/Parasect (a crab) considered Bug/Grass and not Water?
It's a parasite attached to a mushroom that specialized in spore like powders. I haven't seen too many mushrooms underwater.
Sudowoodo. (no explanation necessary)
Not even sure what you mean.
Please show me the Ice or Psychic "look" in Jynx.
It's based on a Japanese ice demon.
How does Togetic (a little 7-pound bird) have such high defenses?
Again this Pokemon is supposed to have mythical properties, mostly ones that have to do with good luck and healing. I don't think it's too bulky, but it's more defensive than most birds.
Besides Pokemon being all numbers (which they're in data) they all have stories behind them, folklore, it's what is supposed to make them entertaining.