where do you think

[ljkkjlcm9]

wherever the hell they want, they're summons they can do what ever they want, some fly in, some appear so whatever.

THE JACKEL

[Renmiri]

in x if 2 summoners summon the same monster who will it come to and there is no way with all the summoning that an aeon hasnt been called by two summoners at once

In X there are even battles between the same Aeon, like Yuna with Isaaru's but each summoner's Aeon has a different name, i.e. Yuna's is Bahamut but Isaaru's is the same Aeon with a different name.

[Eiko Guy]

the name isarru has is their real names

[Tavrobel]

In the event battles that Renmiri mentioned, you are not allowed to summon the same Aeon at the same time as another summoner.

E.G., Yuna's Bahamut is not allowed to be summoned at the same time as Issaru's Bahamut (Spathi). And no, they are not their real names.

[lovehurts]

I remember getting infirit from a libarary in final fantasy 5.... I think you fight inside a book demension thing.

[Croyles]

I keep mine in my sock draw.

[Zeromus_X]

Playing chess, of course. Probably with the other party members you have in reserve.

[Chris]

Eidolons usually come from within, so I'd guess that they're burried somewhere deep inside of me. xD

[Eminem's_No.1_Fan]

Hiding behind a rock laughing at their cruel masters' getting hit by monsters

[Hambone]

sleeping waiting for you to call them... or on eoff.

[vorpal blade]

Inside a cozy little Pokeball.

[Jessweeee♪]

Chillin' like villains at the Holiday Inn.

[NorthernChaosGod]

That's easy, they're all off having a mad summon/aeon/whatever orgy in their home dimension. That's why they're so powerful when you summon, they're pissed that you called them away.