Oh wow, thats excellent to know. I didnt even look into rain/sun after learning that.
I'm fighting Saphira now and tbh I'm laming her out pretty hard, king of lame strats right here.
She cant kill my Tyranitar, no matter how hard she tries, she's struggling really bad, so I'm just spamming toxic and hitting a potion every so often while she just fades away, slipping in a stone edge or earthquake here and there. Doesn't feel great, ngl but it is pretty amusing how 'powerful' Saphira is a single Tyranitar is a wall she cant break through.
Noivern was my biggest issue but with a little jolteon setup with thunder wave/light screen it gave me the possibility to reverse the tide a bit. (currently) she has Haxorus and one other pokemon left, her Garchomp, Noivern and Dragonite have fallen. Thankfully the advice came into full play by dropping the AV and adjusting some EV's from earlier advice really helped push me through this fight. Though the team swap will more than likely need to happen for E4 cause jolteons just a fast support as it stands, doesnt really do much otherwise unless its solely weak to electricity lol.
Used Jolteon to thunder wave if paralyzed, volt switch just incase of focus sash, swap to Salamence for killing blow, Mega Charizard inc, same thing, Jolteon -> Thunderwave -> no stun -> Salamence -> one shot with dragon claw. Swapping Natures probably also helped alot, gave Salamence Jolly aswell.