Firstly - tone down the arrogance. You were one of the best spriters? Says who, you? Why not tell us what this forum is, because i'm inclined not to believe you. Or even show us any other sprites that you've done.
To be honest, your the only one here who sounds arrogant. You act like he should make a spreadsheet of all of the spriters who believe he is good. Even if you get him to tell you the forum and he's wrong, so what? Your here to crit what he has, not his opinion. And given the skill he has shown, he is already probably one of the better ones here, far surpassing either you or me.
Not to mention, he THEN said many people here were better than him, so what exactly do you want him to say?
The concept for this sprite is not a great one to start with. It doesn't look very Pokemon like, and is quite.. I can't find the word, but it seems too simple. It just looks like a dragon.
Not really, it works fine, in fact given how little character the new pokemon being released have, it fits in pretty well with the crowd. Plus, it doesn't help your arguement when you admit that it is what its supposed to be, a dragon. One at that that looks different from any current ones.
The shading seems off in a few places, especially on the curve of it's body. Also, the ace seems very off. Something doesn't seem right with the bump either, it looks too stiff.
Oh yes, THE curve, its not like there are 4-5 of them right? Given the amount of light reach places, the top of that one hump and it's face would be where about the only light would reach, and he also has it correct that there would be less light at the very bottom of his body.
Anywho, I would say as far as the sprite is concerned, follow pretty much what wilycoyote said. I however would also maybe make the back leg that we see a bit darker as it is the part farthest from the light source. Also now that I think about it, the front leg closest to us could use some shading, either a small amount of a darker shade, or a highlight of some sort could help.
Good luck improving the sprite though, I can't wait to see more from you. If you really want a challenge, we have the WSC here(short for weekly spriting contest), which should really tell you how you compare with others here.