Focus Energy would be curious since he only has Blaze Kick, Slash, Shadow Claw, and Night Slash, of which only Blaze Kick seems particularly relevant to how it would play regardless. Feather Dance and Focus Energy are Blaziken's only real utility considerations as a Raid boss, so Special Attacking Electric Damage is almost certainly gonna be the easy way to go alongside generic Screens Support (probably will do Focus Energy for lack of options so use stuff that works through Crits)
Honestly I don't think it's going to have much depth. I more or less expect a Cinderace repeat where it'll have one of Bulk Up / Sword Dance, and that'll be it.
There's a handful other tools they can give it, like Sunny Day, Will o wisp, even Rock Slide if they want to go the flinch route.
In fact Sunny Day actually makes sense, as it serves the triple purpose of giving it a stab boost, neutering water damage, nerfing Thunder accuracy, and if they are feeling spicy, give it 1 turn Solar Beam.
My plans currently:
1) Offensive Zapdos

Zapdos @ Leftovers / Shell Bell / Magnet / Damp Rock
Ability: Static
Tera Type: Electric
EVs: 252 HP / 4 Def / 252 SpA
Modest Nature
- Thunder
- Discharge
- Rain Dance
- Roost
I don't see any reason to bother with Speed EVs giving the near guaranteed Speed Boost. If one is feeling frisky you can run Ancient Power over Discharge to fish for boosts while stacking tera but let's be real, shoulnd't matter.
This assumes no Rock Slide or Stone Edge, though I think if there's a debuffer you can easily live them until tera.
2) Defensive Bellibolt

Bellibolt @ Rocky Helmet / Leftovers
Ability: Electromorphosis / Static
Tera Type: Electric
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
- Chilling Water
- Discharge / Parabolic Charge
- Reflect
- Slack Off / Parabolic Charge
Basically just debuff to win. You can pick which recovery option you prefer, can even run both over Discharge if you run Static.
This obviously assumes no Earthquake or Scorching Sands coverage.
Also needless to say there's probably a few Arceus things that can be done with the usual Iron Defense / Judgement / Recover / Nasty Plot or something defensive with Reflect and debuffs. Can even make a super spicy Trick Room Arceus due to Speed Boost.