If Pinsir does evolve - and I don't think it should - it should have no stat boosts at all, but instead just have its stats reshuffled as Scyther did.
I know Scyther evolved. I don't think Scyther should have evolved either. I really don't think Porygon2 should have evolved. Those are the two Pokemon with the highest base stats that currently evolve; I would just as soon draw the line at 500 BST and say "nothing past here evolves."
Creator of Jay's Journey (see quote!) "It's not ten years old! Therefore, it sucks!" - Nostalgia whores everywhere