Arcanine-Hisui
Nature: Preferably something that doesn't lower Attack or Speed
- Rock Slide/Stone Edge
- Fire Fang/Flare Blitz/Raging Fury
- Crunch
- Play Rough/Anything
Rock Slide is a good alternative to Stone Edge if you don't want to spend money on the tutor. Other Fire-types like Rapidash could also work, but Rapidash evolves late at level 40.
Scyther
Nature: Preferably something that doesn't lower Attack or Speed
- X-Scissor
- Aerial Ace
- Sword Dance
- Anything
You could evolve it into Scizor or Kleavor, but I prefer the speed over greater defense and power. X-Scissor is good stab, and Swords Dance if you want to set up.
Staraptor
Nature: Preferably something that doesn't lower Attack or Speed
- Roost
- Close Combat
- Aerial Ace/Brave Bird
- Giga Impact/Anything
- Anything
If you don't want the type overlap with Scyther, you could use one of the starters or whatever you want. Roost is good healing, and Close Combat is good coverage.
Gengar
Nature: Preferably something that doesn't lower Special Attack or Speed
- Shadow Ball
- Sludge Bomb
- Dazzling Gleam
- Hypnosis/Thunderbolt
You could also use the Linking Cord on something else such as Alakazam, but Gengar is very good. Dazzling Gleam is nice coverage, and Shadow Ball and Sludge Bomb are your dual STABs.
Luxray
Nature: Preferably something that doesn't lower Attack or Speed
- Thunder Fang/Wild Charge
- Play Rough
- Ice Fang
- Crunch
Luxray kind of depends on tutoring to get some of his best moves, but at least he gets STAB and Crunch through level up.
Sneasler
Nature: Preferably something that doesn't lower Attack or Speed
- Close Combat
- Poison Jab
- Iron Tail/Shadow Claw/Dire Claw
- Drain Punch/ X-Scissor
Close Combat and Poison Jab are both good STAB and Dire Claw isn't great, but it can status the opponet. Drain Punch can heal back some damage, but Iron Tail, Shadow Claw, and X-Scissor are just coverage. Sneasler comes pretty late, at Coronet Highlands, so you could use something like Hisuian Lilligant:
Hisuian Lilligant
Nature: Preferably something that doesn't lower Attack or Speed
- Drain Punch
- Leaf Blade
- Poison Jab/Aerial Ace
- Victory Dance/Close Combat
Drain Punch is nice healing STAB and Leaf Blade is also good STAB. Poison Jab and Aerial Ace are decent coverage, and Close Combat is an Alternate, more powerful STAB. Victory Dance is an amazing setup move. Hisuian Lilligant is also a good alternative is you don't want to use Sneasler at all.