>>12147456Me first is used as almost like a mirror move but doesn't have to used last
After you allows the user (used in double or triple battes) to move immediately after the pokemon who used it.
For example, If you have
(opponent's side)
Accelgor + Accelgor
(Your side)
Ninjask + Munchlax
if the Ninjask uses after you, then the Munchlax would be able to move before the accelgors
>>12147575Quash works opposite to After you, instead of allowing the target to go first, it makes them go last, the reason why it's not seen in game is that almost all the pokemon that use it have to learn it via TM and the only pokemon that do learn it via level up is Murkrow and Honchkrow