Most moves can be viable in competitive, if a little niche.
Burning Jealousy: Since a lot of people use stat-boosting moves in battle, Burning Jealousy is likely worth it for the guaranteed burn. It isn't used a whole lot, though, primarily on Incineroar, Torkoal, and Cursola.
Coaching: Bulk Up, but for your allies. Probably one of the worst Move Tutor moves, though it can still be good. It's completely useless in single formats, and it isn't common in doubles. The only Pokemon that use it that are worth mentioning in VGC are Cinderace, Galarian Zapdos, and Pheromosa, none of which use it often.
Corrosive Gas: Non-damaging Knock Off. Can be useful in specific scenarios. It's really only used on Galarian Weezing, but even then it isn't used too much. Knock Off is always better.
Dual Wingbeat: Solid, especially on a Technician Scyther. It sees use on Kyurem-Black, Dragonite, Talonflame, Scizor, and a few other Pokemon. In LC, Vullaby sometimes chooses Dual Wingbeat over Brave Bird.
Expanding Force: Decent, if a little hard to pull off. Hidden Ability Indeedee is a consistent user of this move, but I personally have had success using it on Tapu Lele and Alakazam in the past.
Flip Turn: Yes, yes, yes, so worth it. Water-type U-turn, excellent for escaping tough situations. Barraskewda likes using this for solid damage, and it allows it to pivot to a teammate that could tank a hit meant for Barraskewda. Swampert also likes it in order to switch out into another teammate safely. Keldeo, Sharpedo, and Kingdra also use it on occasion, for the same reasons as mentioned above.
Grassy Glide: One of Hidden Ability Rillaboom's best moves, it's worth it for at least this Pokemon. Apart from Rillaboom, however, it doesn't see a lot of usage (unless you count Thwackey and Grookey in lower tiers).
Lash Out: Could be useful. However, most people will raise their own Pokemon's stats, not lower yours. Thundurus and Tyranitar are two of the more common users of the move, but they don't use it frequently.
Meteor Beam: Unfortunate that it's a two-turn move, but it's a great Special Rock-type move. It sees use on Nihilego, Celesteela, and Omastar, among a few other Pokemon, albeit uncommonly.
Misty Explosion: This is an interesting one. Tricky to pull off well, seeing as Misty Terrain needs to be up. It's not the best move, as the user faints upon use. The only Pokemon it sees even a bit of usage on are Galarian Weezing, Mew, and Hatterene, and even the move isn't commonly used.
Poltergeist: Physical Ghost STAB that Gourgeist, Dusknoir, Alolan Marowak, Golurk, Runerigus, and Dhelmise desperately needed. These Pokemon, now that they get a good physical Ghost STAB move, can perform better than they did before. Most Pokemon in competitive have items, so it should be a safe attack against almost any non-Normal opponent.
Rising Voltage: A nice Electric move, though Electric Terrain can sometimes be tricky to put in play. It works well on Pincurchin to give it a reliable STAB move. Tapu Koko and Alolan Raichu also use it well. Tapu Koko automatically sets Electric Terrain, while Alolan Raichu is commonly seen with a Tapu Koko or Pincurchin partner to activate Surge Surfer (and thus boost Rising Voltage as well).
Scale Shot: It hits multiple times, which is nice. A decent Dragon move. It can see use on Pokemon like Garchomp and occasionally Sharpedo to boost their Speed to even greater levels. Sharpedo is so frail, it would very probably get OHKOd even without the Defense drop, while Garchomp can OHKO a lot of things itself.
Scorching Sands: Essentially a Ground-type Scald. Wonderful move, with a chance to hinder physical attackers, and Ground is a good offensive type. Centiskorch and Ninetales, among other Fire types, appreciate the coverage (though Ninetales usually prefers Solar Beam).
Skitter Smack: Decently powered Bug move. It has some good distribution outside of Bug types, which is nice. Most Pokemon that get it don't need it though, as they usually have a better Bug type move, or don't need Bug moves at all.
Steel Roller: Situational, good only in specific circumstances. Probably one of the worst moves from the Isle of Armor. Pikalytics shows that this move is almost never used in any format.
Terrain Pulse: Terrain-based Weather Ball. Like Weather Ball, it's a bit situational. Can be good to catch an opponent off-guard. Clawitzer is notable because it gets a Mega Launcher boost.
Triple Axel: Cinccino appreciates this move to do reliable damage with Skill Link. Hitmontop runs it to counter Flying types, and Weavile uses it as an alternative to Icicle Crash. Other users include Pheromosa, Lopunny (not too common, though), and Tsareena.
Hope I helped!