Final fantasy 8 riddles

[Cleric]

curing status effects?

[Rantz]

Not curing status effects or anything to do with the train mission.

Mistakes of the past
are quickly neutralised
The solution amassed
from one red oversized

[Karifean]

Hmm, could it be a red Guardian Force, which lets you do things, of which it'd have been a mistake not to do it earlier?

All I can think of here is Phoenix and Ifrit.

My guess is the following:

Mistakes of the past are letting party members die.
They are quickly neutralized by a Phoenix Down/Pinion.
The solution is amassed,
from one red oversized, yeah, Phoenix has a lot of'em.

[Rantz]

It's not a GF, but the red oversized is something living.

[FFIX Choco Boy]

Living organically or mechanically?

[Rantz]

Organically.

[Rokk]

It wouldn't be the Moomba would it, when you use the Friendship Item from Chocobo World, which lets you summon it in battle?

[Rantz]

Nope! I might also say that the red oversized isn't the answer you're looking for, but rather the "solution".

[BG-57]

Hmm, is the auditions for the musical sequence, where you can try out different instruments on the characters but only two combinations sound good.

[Rokk]

Hmmm, is it Norg?

In the battle you have to keep hitting the pods to keep them blue-

Mistakes of the past - not hitting the pods to keep them blue
are quickly neutralised - by attacking them
The solution amassed
from one red oversized -the big red pod

he is organic (inside) and it is done via menus (battle system)

[Gennosuke]

is it the GF, Carbuncle?

[Rantz]

None right so far, but nice thinking with NORG. The menus I referred to in my earlier hint aren't battle menus though, but rather one of the menus you can access via the triangle button outside battles.

[Rokk]

Uhm,

Using a Phoenix Down to revive a dead player.

Mistakes of the past - letting them die
Are quickly neutralised - quick to do
The solution amassed
from one red oversized - Phoenix Downs are in fact large down feathers from a Phoenix

[Gennosuke]

Is it the seeD exams that you can take from the menu, as with missions you can decrease your rank if you perform badly?

[Rantz]

Neither. Remember that the "mistakes" are only mistakes if you consider them as such! Letting a party member die is definitely a mistake except in very specific circumstances, and I don't think your SeeD rank dropping is ever anything else than a mistake.