I'm a lv. 28 psycho. I use the cryptic set and law binder, vera uses the kilma set and the death sentence. Felicity has the furious set w/ the platinum cage and the temporal blade. I'm stuck on yosuke- no idea how to beat him.
It's not that bad if you bring something to do while you wait. Also, if your computer is slow like mine, disabling your teammates will cut down on lag, although it'd put you at greater risk for failure.
Btw what happens when the buff dies? Does he die? Recast? Do nothing?
When the buff dies, Yosuke acts just the same, but without the buff. At this point, you can actually damage Yosuke with a Pyscho, and it won't have any regeneration, either.
The only alternative to waiting out the buff is to redo the entire game with a Bio speed build. With the notorious Withdraw combo, you can easily 1-2 hit KO Yosuke. Unfortunately, Psychs and Hydraulics are out of luck