I’ve played lots of different mons solo, but the following
Ceruledge set is the most consistent and straightforward for me. I have never lost a solo with this, and the only way you can faint is if you get a bad run of consecutive crits. This is as close to solo cruise control as you’re gonna get on this Decidueye raid:
Ceruledge @ Covert Cloak
Tera Type: Fire
Ability: Flash Fire
Adamant Nature
EVs: 252 HP / 128 Atk / 128 Def
- Bitter Blade (PP Max)
- Clear Smog
- Will-o-Wisp
- Bulk Up
For solo runs I play this general sequence of moves every time.
- WoW on Turn 1 to reduce the damage on the first Shadow Claw that you are gonna eat
- Clear Smog Turn 2 to wipe out the Bulk Up by Decidueye and you build Tera #1
- Bulk Up Turn 3 to boost attack and defense, getting more recovery from BB and reducing damage, build Tera #2
- Bitter Blade to recover health, build Tera #3
- Clear Smog to wipe out the Swords Dance, go Tera
- Bulk Up one more time to hit a little harder and reduce damage further
- Bitter Blade repeatedly until Decidueye faints
Once you go Tera, it’s just button mashing BB at that point. Unless Decidueye gets back-to-back crits on Triple Arrows during double turns, you will recover enough health with Bitter Blade to offset all the damage you are taking. If it doesn’t crit, then you barely get tickled and you can Bulk Up another time or two, if you want, but it’s not much needed.
I’ve enjoyed using Corviknight and Armarouge for solo runs, and they are fine. But Ceruledge has had the least variability and is the most straightforward for me to play. Give it a try, if you haven’t already.