>>55842112nah, general fights are too long in late endless. optimal strategy is to just get a setup that can beat 5850 and then skip all non-required fights (paradoxes, eternatus) with run away and just masterball whatever you want to catch.
get a run away mon, a salt cure/leech seed/soak setter and a curse setter, both with sturdy, and then splice a sturdy metal burster into your main carry when it's around level 100k. (optional, but if you don't run this you're liable to eat shit to a double battle with arena trap dugtrio AND you won't be able to restock on masterballs effectively)
then you're all good to skip from the 3000s to 5850 in a few hours.