I don't think this is a very simple question to be answered. Correct me if im wrong.
All my IV and EV calculations came from this:
http://pokemon.marriland.com/statcalc_dp.php
I traded for a impish gligar with these IVs: 31hp/30atk/31def/27spd/29satk/30sdef
So I started with it at lvl 5 no...