PSA: Don't be afraid to fight dirty!
They're shutting down bank in about 6 months, but that's no reason to give up now! Putting it bluntly, we knew this was coming at some point, but given that they're replacing it with presumably nothing, that's just not fair.
The time pressure against us is not normal, it's not fair, so don't be afraid to take any advantage you can possibly claw back in order to get this done on time.
That includes, but is not limited to:
* Using speed up on emulators.
* Changing the date and time on your system of choice for whatever shenanigans you deem necessary.
* Using save states to preserve your already built winning streaks in battle facilities.
* Adding in things like rare candies, money, vitamins, and berries to make the whole process faster.
And it also includes a last resort option that, while very cheaty and absolutely completely 100% against the rules as far as the subreddit's HoF is concerned, is possibly your only option left to get this done if it gets all the way to February and you need more time:
Clone your ribbon master, gen all the ribbons on one of them and send it through to Home, then keep the other on the 3DS and earn the ribbons legitimately after the fact. Advice if you do this: make sure to account for the fact that Bank was also how you'd send Pokémon between gens 5, 6, and 7 as well, and make additional copies in all the relevant games if necessary.
Ultimately it's your challenge, you decide what's appropriate and what isn't. If there are some parts of the process you want to do the intended way for your own sense of legitimacy, you go for it. This is me letting you all know what options are available to you and saying not to feel guilty if that's what you have to do. The terms of the challenge have changed, and it's only natural for the means of completing it to change as well.