Yeah Oni is bullshit.
Status ailments+psi and insta-kills. Either way they can suck up a lot of SP.
Honestly, once I got my head around killing their healers/High Pixies, it wasn't
that bad. Especially since a group of 3 High Pixies basically Dormina'd my entire party to full health and SP to continue to grind.
So I've got like 250,000¥. 100,000 of which goes to a S. Link in a few days, the rest I can spend on SP regen items or save for S. Links. I'll probably hold off until I take his heart on getting the SP regen items just to make sure I'm not hitting poor. But I'm going to trade Edgy Potter's Invigorate 1 SP Regen item in for the Invigorate 3 one so I don't have to (*knock on wood*) worry about SP problems using him like the P3/P4 protagonists via switching Personae like it's going out of style in battles to one-more everything possible.
Confusing the mid-bosses like
in the main dungeons works wonders. You don't have to go to Momentos like that "guide"/video says to do. You can confuse some of the mid-bosses in the story dungeons. The problem is grinding the cash to resummon the Persaonae you're using for this up in Luck with the resummoning it (to reset cooldowns) and summoning the treasures to Luck EXP buff it.
My party has been since starting: Yusuke, Ann, and Makoto since the later two are healers and Makoto is Nuclear element damage (and has a all Nuclear hit skill that I didn't have for a while). I subbed Yusuke and Makoto out for Ryuji and Morgana for the
spoiler (click to show/hide)
Elevator with 3-guards
fight and just confused the golden one for some more cash while physically attacking/weakening the others. Did decent despite the gold one hitting like a truck if I didn't time (3 turns confusion) the wear off on confusion.