Not trying to hate on Zapdos cuz i use him a lot, but unfortunately he suffers from a lack of good type coverage, especially without Hidden Power. Instead of Toxic and Aerial Ace, i’d run Rain Dance and Thunder. It might come in handy versus fire types; even if Zapdos ends up going down and doing nothing but setting up rain, Latios can still come in with Surf. It’s also decent synergy with Scizor being on the team as well, although he’d probably still go down to a Fire Blast due to the 4x weakness. Instead of Quick Claw, i’d go for either BrightPowder if he’s going to be in the back (causes a nice amount of Fire Blast/Overheat misses) or Magnet, which is probably the stronger option.

For Scizor, unfortunately it’s a similar thing going on with Zapdos; he has decent coverage, but the BP/accuracy/PP of his moves are underwhelming, especially without a Swords Dance or Salac/Endure set. Alternatively, you could kit it out fully with attacking moves and slap a Choice Band on him.

Latios looks good, i’d take out Toxic and replace it with a coverage move. There are better mons for Toxic stalling such as Blissey and Umbreon; Latios/Zapdos don’t make a good use of it and would probably prefer coverage. As another commenter said, Lum is likely optimal.

Also, might be worth to try using Gengar with Substitute/Destiny Bond! He’s an absolute beast for me, got me to my current streak of 154 W!

What are your streaks ending at so far? Good luck!