See related links section.
I think night slash because more Pokemon can learn slash but few can learn night slash if it weren't a TM
95
Sceptile, to my knowledge, is incapable of learning Night Slash.
First, do not evolve your sneasel, second, find a heart scale, third go to the move relearner's house. Give him the heart scale and select your sneasel to relearn night slash
It learns slash at level 28 I think
Level 31
Absol learns the move Night Slash at level 41. Absol also learns the Psychic type version of Night Slash called Psycho Cut at level 47.
Air slash is a 4th gen move. So Crobat wouldn't learn it in 3rd gen games.
Gallade can learn night slash, but not by level up. To teach Gallade night slash the player most go to Pastoria city and go to the south part of the city then go into the house at the top right of the southern part of the city. There is a guy who can teach Gallade night slash for a heart scale and all other moves it learns before that. I hope that helped!
Shadow Ball
Armaldo learns slash at lv. 55 For more Info about pokemon's check Serebii.net Jonsi:D
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