Greninja with Mat Block should work out quite nicely.
Mat Block works like Protect and Fake Out. It protects all allies from damaging moves, but can only be used the turn it is switched in (it also doesn't have priority, so you need Greninja to be quick).
SneaselSnow sent out Aerodactyl and Greninja!
Notsoyoungsterjoey sent out Blissey and Shiftry!
Greninja used Mat Block! | Aerodactyl is charging!
Blissey used Wish! | Shiftry used Night Slash! Aerodactyl is protected!
Greninja uses Water Shuriken! It hit 4 times! | Aerodactyl used Sky Attack! | Shiftry fainted!