Night time caries with it a 10-20% (the exact number wasn't confirmed) accuracy decrease for all non-Dark or Light-type Pokemon. Harskrow, Wolvine and Cackinge all benefit immensely from Night. Raiger shores up basically everything in the team. This isn't quite like Abomasnow. Also there's Rocket Punch, which can be quite potent since most Pokemon go to high happiness in competitive. To be safe, most people would probably put their happiness at about half which would give Abyssus a 90 BP STAB. It also has an excellent special movepool with a relatively decent stat to use it with. Since Egg Moves for it haven't been done yet (which is where we generally shore up some competitive flaw or give some new direction to the movesets), and the Absol revamp hasn't been done yet (which would shore up even more), you can influence this as much as you like in the revamp.

For Arachmare: I don't think ingame really counts as far as movesets go. Giving a midrange move when a Pokemon needs it, fine (Bug Bite's there, it's actually good enough for ingame), but if Gyarados can live on Thrash and Surf, surely Bug Bite is enough at least until it gets Hypnosis/Dream Eater. Arachmare doesn't really seem like the Pokemon to get Signal Beam by level up, and even then, only at levels 35+ (Where it gets Dream Eater). It's a night-time predator, it doesn't want to be flash around with beams. Dewgong has always had things like Aurora Beam, which makes the transition more natural, and Venomoth may as well be a Psychic-type, it shares so many moves with them and even learns Psybeam and Psychic naturally, I'm pretty sure.

As for little move changes that you feel need implementing, in the previous forum there was a "little corrections topic" in the Moves, Items, etc. forum for small things that didn't seem right. So, we do allow changes, one at a time, to the movesets if it feels like something is missed (for example Goldrake didn't have Pay Day for a while), though you have to make your case and have several people agree. I'm remaking the topic now.


Also, I'd just like to say that I appreciate having someone to argue with again, it's been a while. :3 I hope you stay for a long while, Zenith.