Here are some moves with a case for lifting from "Not ever useful". I'll save some words and not put "Just altogether an okay move" or "A niche option" in front of every move. You can probably guess what use these moves could serve. They are just generally "decent" things that exist.
Acid Spray. Mentioned in SM Tentacruel and Nihilego analyses.
Bulldoze (for singles). Used for SS Drednaw, slotted for SM Entei, mentioned on random Ground-types.
Cosmic Power (and its clone Defend Order). Primary-slotted for SM Sigilyph. Maybe "if the user has Magic Guard"?
Final Gambit. Mentioned in SM Accelgor, used for XY Accelgor, used for XY Ninjask.
Flail and Reversal: If Generation=3. There's probably a lot.
Future Sight: Primary-slotted for SS Slowbro. Slotted for SS Slowking. Primary-slotted for SM Slowking. Prob restricted to Psychic-types though.
Heat Crash: Used for SS Stonjourner.
Mean Look + Spider Web: If user has Baton Pass and Generation<5. Trappass, e.g. RS Umbreon.
Metal Burst: Slotted for SM Bastiodon. Maybe if user has Sturdy?
Poison Fang: Primary-slotted for SM Silvally-Poison. Mentioned for SM Golbat. Prob restricted to Poison-types though.
Pollen Puff: No analyses, but it's basically Bug Buzz. If the user doesn't have Bug Buzz, maybe?
(Whirlpool or Infestation or Fire Spin or Snap Trap or Clamp): If the user has one of these and Perish Song. No Pokemon has both Snap Trap/Clamp and Perish Song, but Zap Cannon is given a No Guard exception, so thought I'd mention it. Didn't include the other partial-trap moves because they have immunities. SS Arceus-Water is an example analysis Pokemon.
EDIT: More suggestions.
Jaw Lock. It's comparable to Spirit Shackle, but traps the user too in exchange for being boosted by Strong Jaw. Too awkward in its sole learner, but just as a move, it seems alright.
Night Daze. Consensus now is that Dark Pulse's 5% accuracy and 20% flinch trumps Daze's 40% accuracy lower and 5 BP, so you won't see it on analyses these days, but they're comparable enough that the consensus is somewhat arbitrary I think? BW Zoroark slots it on 3/4 sets.
Power Trip: Used on SM Incineroar. Comparable to Stored Power.
Rock Tomb: Currently requires Technician, but is used on non-Technician Pokemon like SM Groudon-Primal and SM Excadrill.
Shadow Force. Used for SS and SM Arceus-Ghost. Mentioned for SS Giratina-O. Neither gets Poltergeist (yet?), but "if user doesn't have Poltergeist" would certainly be an objectively reasonable restriction.
Soak. Used for SS and SM Pyukumuku. Being able to freely Toxic things or remove STAB+guarantee type matchups (Lanturn?) gives it some use to Pokemon besides just Pyukumuku.