What is a good moveset for Eternatus? (page 2)

Question

If you have a good competitive moveset for Eternatus, post an answer below and upvote the best ones.

Be sure to include full set details in your post, e.g. items, abilities, natures and EVs. Some explanation, including the intended game mode for your set, is also appreciated. Access the full list of guidelines here.

Eternatus Pokédex and learnset for reference.

Answer 1

Eternatus) @ Mental Herb
Ability: Pressure
Tera Type: Fairy
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Cosmic Power
- Recover
- Dynamax Cannon
- Flamethrower
This allows eternatus to get tanky and restore hp with recover if the opponent has taunt or encore the mental herb breaks you out of that dynamax cannon and flamethrower are two powerful attacking moves and tera fairy allows you to get a free cosmic power up into dragon type moves