I have read about the strategy in using Mean Look with Perish Song. But if I use Baton Pass after using those moves. Mean Look will still have it's effect. but will perish song affect the pokemon that was switched in using Baton Pass? Note: If you are wondering which pokemon learns Baton pass,Mean Look and Perish Song it is Absol.
All Pokémon on the field faint after 3 turns. Even Pokemon that are in the invulnerable stage of Bounce, Dig, Dive, Fly, and Shadow Force are affected. If a Pokémon affected by Perish Song uses Baton Pass, whatever Pokémon is switched in will still be affected by Perish Song. The perish count will not be reset in that case. Switching a Pokémon out regularly or via U-turn will remove the effects of Perish Song from that Pokémon.
http://www.smogon.com/dp/moves/perish_song