For the hybrid Psycho build strategy against Yosuke, I meant that both teammates should be on Phalanx, not Defensive. As for putting Roald on relentless for one turn in hopes of getting the extra 10% damage, you really do need him to cast Greater Purpose right away, otherwise Yosuke will knock you down too far with his second attack. I don't think the extra 10% will help kill him much quicker.
As for the Epiphany kill, yeah it is quite the sacrifice move. In fact, when I first tried it, I almost quit and reloaded when he killed me, but I waited to find out how much damage Epiphany would do. What a nice surprise to find out it killed him after Sonny was "dead" - talk about striking from the grave. :)
I've gone back and forth with using Insecurity or Dark Echoes in that attack combo on him. Dark Echoes does give a better damage boost (24% vs 20%), but Insecurity is guaranteed to hit. The shadow Psycho build tends to have fairly low speed and Yosuke has very high speed, making Dark Echoes miss pretty frequently.
I used Confinement after Epiphany since the former lasts five turns, and the latter lasts seven turns. Swapping the order would lose one turn of effectiveness for Confinement, and since Yosuke regenerates only 300 health each turn, it's not really missing much.
About the PvP stuff.... I'll leave a quick comment here, but we should take that to another thread, like this one: [url=http://armorgames.com/community/thread/7778216/sonny-2-pvp-for-the-pro-nonstunners/page/1]
About a speed Bio in PvP - Agile Exposure only last 2 turns, giving the attacker only 1 effective turn to attack while it's still on. So, if you use it before using Shadow Blend, it's essentially wasted (teammate attacks do benefit from it, though). But ultimately, vesperbot is correct. An Ice Hydro will end up being a solid punching bag. More on the other thread....