you have to get a pokemon such as Golbat or some other flying pokemon that can learn it. i know this is true because i have gone against golbats that know air slash and i have one too
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yes but you have to get the TM first
none
There is no TM for Air Slash.
Crobat learns air slash at level 51
Togekiss learns air slash at base level, so you have to use a heartscale in order to be able to teach Togekiss air slash.