This is just my opinion on the TMs from my play style. Please don't get mad.

Ranked from the worst in my opinion to the best in my opinion regarding moves. I'm ranking based on power, accuracy, and usefulness later on in the main story.

10. TM 38 Will O Wisp (Kabu)

Reasoning: Will O Wisp is a fairly useless move for the main story and in general. It's only really good for catching Pokémon or PvP or very early on in the game, maybe for Milo if you are having issues but that is highly unlikely. And by this point you'll likely have a good fire move that has a chance at burning your opponents (Ember, Flamethrower from a max raid, etc).

9. TM36 Whirlpool (Nessa)

Reasoning: Whirlpool isn't very strong in general and the accuracy is awful like the other trap moves (Sand Tomb, Fire Spin). Maybe for early game but even back as an HM it sucked. Better off teaching it to a water type your not using to catch Lugia in Soul Silver if you ask me.

8. TM27 Icy Wind (Melony)

Reasoning: Another reason to do with accuracy. This move is better for mid game and double battles but you can get much better ice type moves by this point like Ice Beam.

7. TM48 Rock Tomb (Gordie)

Reasoning: A mostly mid game/early game move by this point. And nearly any Pokémon with Ground/Steel/Rock learn it naturally anyways. And you're better off with Rock Slide by now.

6. TM85 Snarl (Piers)

Reasoning: A decent move but it's being ranked at 6 for it's Power and Accuracy. It's higher then Rock Tomb because most pokemon don't learn it naturally through lvl up.

5. TM10 Magical Leaf (Milo)

Reasoning: A very good grass move even for late game and it's accessible really early (being the first gym). This move is basically a grass type Swift. It's a decent power, being at 60.

4. TM99 Breaking Swipe (Raihan)

Reasoning: Another really good move but you get it super late in the game. The reason it's above Magical Leaf is because it afflicts     Stat Lowering. It's not any higher due to the lack of super effectiveness of Dragon Type moves.

3. TM42 Revenge (Bea)

Reasoning: Power is boosted when taking damage and it's a better alternative to Counter. Reason it is number 3 is due to the fact the user has to take damage before the move's power is increased.

2. TM87 Draining Kiss (Opal)

Reasoning: A healing move because why not. Reason it's higher up on this list is due to type super effectiveness.

1. Tm77  Hex (Allister)

Reasoning: Hex is one of the best ghost moves out there. Perfect on the Litwick line due to Flame Body. And it's power is doubled if the foe has a status condition.