That would be pretty awesome.
You should make sure you don't just have stats if you do make it, graphs are much easier to see. I don't see too many sites with graphs that have this sort of function
Maybe you should even include a part that would include the attack types the pokemon has, to see what its strong offensively against and weak offensively against, along with your idea of what its defensively strong and defensively weak types. That may be a bit complicated, but its worth a thought.
Let me clarify:
Defensively is what Jungle Boy suggested way back in post #6
Offensively would have an input of what the pokemons attack move types it has, so if you had a ground attack move and rock attack move it would show its strong against rock and electric (but not very effective against say another ground type) in one move, and strong against flying and bug in the other. So it would show what its strong against. (although it would show a list like in the link shown in post #6.)
Although It may be a bit much to chew.