Analytic works on switches, meaning that should you want to switch in your check, it would be forced to take the equivalent, of 2 Life orb of whatever attack was about to hit it. for example
252 SpA Life Orb Starmie Hydro Pump vs. 252 HP / 4 SpD Clefable: 212-251 (53.8 - 63.7%) -- guaranteed...