Protect does NOT protect you from Mean Look. If they use a move to switch out or use the item Eject Button, they will be able to cancel Mean Look and Perish Song on them. However, you will faint afterward. However you can use this:
Gengar (M) @ Focus Sash
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Mean Look
- Perish Song
- Filler Moves
First, use Mean Look. Then use Perish Song. They will be stuck into battle. The count drops. Then use Protect to stall 1 turn. The count drops. Use the Filler Move. The count drops. Since the opponent can't switch out, they will be forced to Attack you. Then, switch. Your opponent attacks the Pokemon coming in, and faints of Perish Song.
Works with: Gastly, Haunter, Gengar, Smoochum, Jynx, Murkrow, Honchkrow, Misdreavus, Mismagius, Smeargle, and Absol.