Evolution and stat growth

[color="#cc8899"]I can't remember how this works -

was it "stats before evolution remain intact" or "once you evolve, it's as if you'd been evolved the entire time, and stats change to reflect this"

For example, Scyther gains far more speed per level than the evolution, Scizor. If Scyther is raised to lv 100 and has imaginary speed of 350, but Scizor raised to 100 would have speed of 300, would the speed suddenly drop to 300 or would it remain at 350?[/COLOR]

It would drop. When you evolve Scyther into Scizor, its speed gets cut in order to balance attack.When you evolve, the stat changes take place then and there, rather than a gradual adjustment into the stat change.