same as your except i had guardian form instead of subversion. im not sure why you're struggling. just try to get the vitality to around 150 which is 5k health

That sounds about right, though when I did it, I think I had Guardian Form in there instead of Subversion, but I can't remember.

Regarding the Hot Hydro re-spec for the Time Bomb, I finally got the achievement from Kurohami's suggestion (I didn't have 600 strength exactly, but I was close enough at 582).

should i list all the equipments and weapons i have in my inventory and on all team mates?

It could help.  I did that when I was having trouble with a battle and it helped me get through my problem with the advice of others.  Though I would just list the three people you're using.

Regarding the Nostalgia fight, I wasn't expecting him to fire off some instant-KO ice attack at me.  Of course, I think my mind freezes were both on cooldown at the time, so if I had silenced him, I shouldn't have seen it.

kk

Sonny:
-Old ZPCI Helm
-Tenacity of Clemons
-Old ZPCI Gloves
-Bone Braces
-Misted Greaves

-Shandor's Darkstaff

Veradux:
-Mask of Horror
-Charged Armor
-Pride's Grip
-Bone Braces
-Venomsteel Greaves

-Frozen Runeblade
-Lavastone Barrier

Felicity:
-Mask of Horror
-Imperial Armor
-Titanium Grips
-Colonel's Leggings
-Titanium Runners

-Azure Flatblade
-Riot Shield

He did it to me again!  And I had him silenced as well!  He just...  came outta nowhere and struck me for over 10K damage, killing me instantly.  Worse yet, I can't seem to predict when he does this, as both times he did it, the attack animation was different.

Regarding Mephisto's party equips, I would probably suggest upgrading Sonny's helm, gloves, and bodywear if you have the cash or suitable drop item with which to do so.  You'll need the mining helmets for when you get to the Specialist/Hound/Hound fight, as the Physcial Defense boost will help (for that fight I would also recommend temporarily replacing Sonny's weapon with a Frozen Runeblade and Riot Shield if you can spare the cash).  Other than that, I cannot see too many problems with your current setup, though I would probably replace Shandor's Darkstaff with Law Binder when Sonny reaches Lv. 21 and you have the cash to do so.

Well, I certainly feel like an idiot now.  Those times when he got me with 10K+ damage were when he casts that Dark Omen thing, and I forgot to cast either Subversion or Flash Freeze.  I guess I wasn't expecting that large a boost to his attack power or something.  Anyways, I finally beat him, though I screwed up twice on the timing for Subversion when he gets down to around 10K HP.

You DO NOT need to train Roald to lvl 30,only to 19!! When you fight the time bomb you just give Roald emerald death!! Trust me,he does enough damage

one question, what does instinct do for sonny or for anyone?

i really like your guide but am i missing something in zone 5 with the android guard and the riot policex2 because i cant seem to get past them. i gave felicity the riot gun and vera frozen runblade and lavastone barrier but the police keep dealing crazy crits and my whole team dies before i can kill any of them.