#$%&ing Waldo and @#$%ing Carmen

[CimminyCricket]

in my head i'm defining powerful as kotr/mime/etc

are you on the north continent?
are you near junion?
are you near midgar?
are you kalm?
are you that mini desert with the midgar zolom?

[Jiro]

are you on the north continent?
are you near junion?
are you near midgar?
are you kalm?
are you that mini desert with the midgar zolom?

No.
No.
No.
No.
No.

[Karifean]

Does a dot (specifically) represent you on the world map?
Are you on the western continent?
Are you on an island, as in not on any of the three major continents?
Can you be accessed on Disc 1?
Is visiting you mandatory?

[Jinx]

Are you the Temple of the Ancients?
Are you the City of the Ancients?

[Jiro]

Does a dot (specifically) represent you on the world map?
Are you on the western continent?
Are you on an island, as in not on any of the three major continents?
Can you be accessed on Disc 1?
Is visiting you mandatory?

No. (I don't think so. It's more likely to not have one than actually have one.)
Yes.
No.
No.
No.

Are you the Temple of the Ancients?
Are you the City of the Ancients?

No.
No.

[Karifean]

Are you Lucrecia's Cave?

[Jiro]

Are you Lucrecia's Cave?

No. (But I thought about using this one before I chose the real answer, so funny how you came to this conclusion!)

[Karifean]

There aren't that many places on the western continent you can't access on Disc 1, especially if they're also NOT special-chocobo-exclusive yet still associated with "powerful" materia (admittedly I had fogotten about that last part).

Are you the secret room in Cosmo Canyon containing the Full Cure materia?

[Jiro]

Are you the secret room in Cosmo Canyon containing the Full Cure materia?

No.

You'll figure this one out by process of elimination and be unhappy until I point out a semantic point and you'll be like "ohhhh "

[Jinx]

Are you the Ancient Forest (forest near Cosmo Canyon)?

[Karifean]

Ugh, I have a bad feeling about this.

Are you a sublocation to a location that is also accessible at earlier points of the game? (exactly like the secret room in Cosmo Canyon)
Are you home to a specific, unique materia?
Can you be associated to a sole specific party member?
Are you mobile?

Are you the Ancient Forest?
Edit: Beat to it, damn.

[Jiro]

Ancient Forest is indeed the answer. It's like, Slash All or something in there, so I consider that powerful enough. Jinx girl, you're up!

[Jinx]

and goooooooooooooooooooooooooooo

[Jiro]

Old school?
Modern?
Golden age?
Are you a world map region?

[Jinx]

Old school?
Modern?
Golden age?
Are you a world map region?

No.
No.
Yes.
I'm not sure I understand this question.