Regarding my own switch ins...
Normal: Excadrill, Aegislash
Rock: Excadrill, Aegislash, Garchomp
Ground: Rotom
Bug: Rotom, Azumarill, Excadrill, Aegislash
Ghost: ಠ_ಠ
Flying: Excadrill, Aegislash, Rotom
Steel: Rotom, Excadrill, Aegislash
Fighting: Azumarill, Roserade
Poison: Azumarill...