Right first of all, to fight Nemesis you must : Catch 10 of every find in the whole game (that can be caught) and when you have all of them you must defeat all of the 'Original Creations' and then you will be able to fight Nemesis.
Second, I don't know why people say Penance is in the Farplane...HE IS IN THE CALM LANDS!!!!!! Anyway to fight Penance you must defeat EVERY Dark Aeon. Yojimbo you have to fight and defeat five times in a row. And Ixion you have to fight twice. Here are the locations for all 8 (10 if you count the Magus Sisters as 3) Dark Aeons.
Valefor : Entrance to besaid, just go to the gates.
Ifrit : Where Home used to be, when you get there an Al Bhed
will talk to you select 'yes' to agree to look for her
child go north and the battle will begin.
Ixion : Thunder Plains North, walk up to the soldier under the
lightning rod tower.
Shiva : Entrance to the Temple Of Yevon-Macalania, A.K.A Macalania
Temple.
Bahamut : Where you fought Yunalesca, Zanakand, The Beyond. (Star
Field)
Anima : Go to the first trial of Mt.Gagazet, Wakka's Ball. This
time its a hell of a lot harder. Do it and she will appear
at the Gates Of Gagazet.
Yojimbo : The Cavern Of The Stolen Fayth. Go to were you got Yojimbo
and then go south, towards the Save Sphere. And Yojimbo's
Summoner will appear and you will have to fight Dark
Yojimbo. Chase his summoner and you will have to fight him
another four times. Five in all.
Magus
Sisters : Go to the Mushroom Rock and you will see a mother and child
near the road to the command center. Run into them and a fat
person will appear, then you will have to fight them.
Penance : You will now see a cut scene over the Calm Lands. You can
now select Penance from the Airship as a location.
Phew..... Took like 10 mins that did......( I type fast)
Philosification of life: How do you prove that you exist? Maybe we don't exist...
I´m sorry...
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