Just had my first bout with ole nergy.
Everything was going smooth, just listened to the tip they gave before the fight to fight from under him and had him limping by 10 minutes in (its insane how safe you are by its butt), and then he did a second dive bomb really quickly after he had just done one and clipped me, then immediately after I ran back from that death he combos me. Thankfully he didn't have much left so he went from there, got a gem.
I need that eyepatch in my life, gonna be like the earrings all over again.
Not sure, my weapons go up to rank 7 though I haven't gotten anything past 6 yet just due to available parts.
I've been playing solo so I suppose that helps in this case, but honestly I never had a problem with zenny in the old games either.
I keep my weapons as up to date as I can and I have a bunch of weapons since I use DB's and need at least 1 per element. The armor I only put upgrades into as I feel I need it, but typically just upgrading parts for different skills keeps my def up enough to not feel the need. Like I just killed nergy for the first time and I have 225 def which feels fine. I tend to only invest the spheres when I have a piece worth keeping and nothing I'm wearing right now is all that great. For some reason there just doesn't seem to be many armors with offensive skills up to this point.