We are not asking you to remember half or all the strategies, but if you make more than one "progression" parties in PF (you start them so it's your rules, gbye jerks) - yes it will take more than 3 attempts into one session.

It takes some peeps Months to clear it.

If you are not ready to invest the time, as this game is a time investment no matter what you do, I have no choice but to side with others and.. you might end up having to pay for T5-6-7-8-9-10-11-12-13. (Might toss in a few EX Primals)

I am pretty sure you can find decent people that are willing to take the time to go by phase, then you wipe, then next phase since you learned the first one etc..

Me and my FC mate just cleared it 2 weeks ago. Not because we had a hard time by ourselves, it was harder to setup a whole group to progress and kill.

So roll up your sleeves, get into it, and you shall prevail and get your win, and comeback to brag about it right here!

Good luck to you.