One opinion is Night Slash and the Shadow Claw aren't better than 1 or the other because they are variations of the same move but they are of different typings. Another opinion is Night Slash is always better than Shadow Claw because it's Dark vs Ghost. Only difference is Shadow claw can't hit Normal-type Pokémon. Another opinion is provided Ursaring could learn Shadow Claw which it can't, Night Slash would be the better option since it'd be capable of hitting any and all Pokémon types whereas Shadow Claw, being a Ghost-type, it wouldn't be able to hit a Normal-type.
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I think night slash because more Pokemon can learn slash but few can learn night slash if it weren't a TM
there is no night slash in diamond
Sceptile, to my knowledge, is incapable of learning Night Slash.
Breeding Gen 5 Sandshrew Sandslash Farfetch'd Teddiursa Ursaring Torchic Combusken Blaziken Slakoth Vigoroth Slaking Zangoose Seviper Shinx Luxio Luxray Oshawott Dewott Samurott Cubchoo Beartic Heatmor Get a Female Oshawott Dewott or Samurott. You can get on by mating Oshawott Dewott or Samurott with a Ditto and keep hatching eggs until you get a female one. (but you only have 12.5% chance of getting it.) Then breed it with any of the above Male Pokemon. It has to know Night Slash. Then hatch an Egg for the results. The Oshawott should know Night Slash