Be creative, but don't pick legendaries. Pick a Pokémon, pick 4 moves, pick an ability and tell us why.
Vibrava - Levitate
Vibrave is my choice because it is small enough to help clear buildings and with levitate it will make minimal sound while moving. Dragon pulse and Rock slide make good abilities for taking out zombies and substitute makes a good decoy to attract zombies to it.
What about you?