There's a reason why Switcheroo isn't on this set. This isn't meant to Trick, but rather anti-trick, to Trick against Trickers such as Alakazam, who also happens to be a Special Sweeper, but it sounds rather enticing. If Alakazam gets Lagging Tail, though I'm not too sure about it, it will move last, making Lopunny's Mirror Coat go first, though I could be wrong, since they[Smogon] say it will move last as long as the moves are in the same priority bracket.
So now it's:
Lopunny@Lagging Tail
Klutz/Careful
252 HP/188 Sp.Def/ 68 Spe
-Mirror Coat
-Return
-Substitute/Toxic/Switcheroo
-Baton Pass/Protect