Re Arceus: Okay yeah I didn't know he had Pokemon Maintenance. That's so random, not sure why GameFreak didn't want to let people hilariously use Trick to switch around Arceus's forms mid-battle, seems like it'd be fun. (Since I'm pretty sure when in Normal Form, Arceus's buff game is not going to outpace MP draining -> HP draining off Excalibur speed.)
Re Squall / Ramza: This is definitely a cool match but also a headache of a match, since I suspect this is one of those ones where if one side knows the other side's setup in advance, they can probably equip for a counter-setup that should beat it (although with different degrees of reliability), so you have to assume they both go in blind and randomly pick setups. I'd also add that in general I don't respect Math Skill as being consistent at all - I'm going to assume Squall can camp at height 1 and enter the fight at level 98 and the CT doesn't line up for Ramza until turn 2-3, which makes Reflect from *Squall* more interesting...
...checking the Battle Mechanics FAQ, every 4 points of Spr reduces the chance of magical status by 1% (same with Vit for physical status), + your status defense. (And... I guess I can see Esuna & Holy maybe helping out here, they do hit all the statuses in the game between them, although this is real shaky as usual - kind of like Lunar Alex maybe resisting elements not in Lunar because he resists all elements in-game, but his resistance comes in separate parts.) Anyway, Squall can get +85 Spr if he junctions Full-Life, or +95 if he wants to blow his Ultima there. That's ~20-25% resistance above average if scaled to unjunctioned (and something less if scaled to half-junction if you scale status resistance, which maybe you don't anyway). The Spr+20/40% abilities are on shenanigans GFs so they're out. I think this might yet be enough to give Squall two turns, but it's not clear. (He really wants you to let Esuna resist statuses FFT Esuna clears like Frog for another ~20% resist... which is sorta reasonable to me, but I can see it not per above.)
...and now that I think about it, I enforce charge times for FFT, which makes lack of Math Skill hype more damning here. It means that Squall can threaten to bust through Blade Grasp with Darkside OHKO, which makes Ramza more dependent on MP-Switch strats, but MP-Switch strats are soft to exploit Squall failing to cast Reflect or doing an Aura rush. On the other hand... Move-MP up will give enough MP to both cast Frog & have 1 MP left to not die the next turn, so something like MP-Switch + Move-MP Up -> spam Paralyze/Frog might well give Ramza 2 shots of it. If Squall opens with Aura, use Dispel Magic... although Squall can use Cerberus and sit on Auto-Haste & Spd & Spr junctions.
Okay, just thinking out loud here, but if Squall isn't explicitly countering a Ramza build, Cerberus is definitely the safest. Auto-Haste, Spd+40% AND Spd+20%, HP/Str/Spr/Spd junctions, and St-Atk / St-Def x4, so if Squall tanks through status it's with this. Squall can offer a bunch of statuses to S-Atk junction attack with and he's definitely going first with this setup, and if Ramza picks wrong, Squall just smacks him with Silence/Sleep/etc. and wins. Okay, so Ramza wants Blade Grasp vs. Cerberus not MP-Switch. Squall opens with Triple. Even without Magic-junction, Triple Meteor should still crush an Aegis Shield, and Reflect Mail is useless here... so Ramza needs turn 1 status or good luck on resisting Meteors, because while I'm skeptical of FF8 speed hype, I'm not *that* skeptical vs. Auto-Haste and obscene Speed. So I suppose this is where I go back to the DL: what else can Ramza toss at Squall in this scenario to win turn 1? (Math Skill'd Status again for some, sure, but anything else for me who wouldn't really hype that?). YOLO double-weapon physical status smack with Reflect Mail to stop a Squall T1 status attempt? Some wacky Faith-ignoring status?