Could you make it?

I would try like hell but I'd never be able to do that one on any Pokemon, even Wailmer or Ponyta

Impossible without scanners to know where the Natus are.

I would find a way since there is no chance I'm ever gonna an ex pass.

That quest would probably gather dust in my quest log. Not for the lack of trying, but 10 excellents in a row on Natu is brutal.

I can make this one:
Hit 36 excellent balls in a row in 3 latios raid
I don’t know which one is easier

Pretty much impossible, lol, would fancy my chances on slowpokes, wailmer, sudowoodo & ponyta tho, should be afew more difficult challenges for better rewards imo

Same account 12 EX invites from January 30th to April 29th, schedule is pretty full, I wouldn't be able to make it

Most likely no. Even the part of finding 10 Natus and skipping catching everything else would feel bad for all the lost stardust on the way (I pretty much catch everything I see if I'm not in a major hurry) and then hitting an excellent on all of them just ups the difficulty way too high.

To be honest I wouldn't be particularly excited for a level 15 Mewtwo, I'm at the point where I send extras to the professor if they can't top the IVs of the Mewtwos I currently have and I have invites for the next two EX waves. Super difficult quest with a reward I'm not particularly interested in? Instant recycle.

Too hard, the reward should be level 40 Mewtwo, guaranteed with 100% IV,

Even harder one: hit 100 consecutive excellent curveballs on Exeggcute. Reward: level 100 (CPM around 1.1–1.15) 90+% IV Mewtwo.

I get so many ex-raids I dont show up to some cause I dont want to wake up early...
Hard answer: No