In Final Fantasy X the summons are called aeons. There are not as many as in other FF's. Yuna is the only one who can learn them, because she's a summoner. If you summoned an aeon you can fight with it. You can attack, do specials, magic. Every aeon has his/her own Overdrive (except Yojimbo). Each aeon has it's stats like HP/MP/Str/Mag etc. The first five are received during the storyline, the last three are hidden aeons.

	Name: Valefor
	Obtained: Temple of Besaid
	Special Attack: Sonic Wings
	Overdrive: Energy Ray
	Overdrive 2: Energy Blast
	Description: Valefor can evade many attacks from the enemy because he can fly and he also is very agile. If Yuna possesses the weapon Nirvana this aeon can to do a damage of 99.999. You can get his second overdrive if you talk to the girl in Besaid that has a dog. If you talk to her and then to the dog, the dog will give you Energy Blast.

	Name: Ifrit
	Obtained: Kilika Temple
	Special Attack: Meteor Strike
	Overdrive: HellFire
	Description: Ifrit is a powerful aeon that has the power of Fire. If you cast Fire on himself you can cure him. If you want to make more damage than 9.999 you have to get the weapon World Champion of Wakka.

	Name: Ixion
	Obtained: Djose Temple
	Special Attack: Aerospark (it disables any any good stat on one character: Haste, Shield....)
	Overdrive: Thor's Hammer
	Description: This aeon possesses the power of electricity and can cure himself if you cast Thunder on him. Ixion can reach to do a damage of 99.999 if Kimahri possesses the weapon Longinus.

	Name: Shiva
	Obtained: Macalania Temple
	Special Attack: Heavenly Strike (the enemy loses his turn)
	Overdrive: Diamond Dust
	Description: Like Valefor, Shiva can evade many attacks of the enemy. She possesses the power of ice and if you cast it on her it cures her. She is known as the queen of ice and like other aeons, she can reach to do a damage of 99.999 if Lulu possesses the weapon Union Knight.

	Name: Bahamut
	Obtained: Temple of Bevelle
	Special Attack: Impulse (powerful attack but Bahamut loses a turn)
	Overdrive: Mega Flare
	Description: Bahamut is very powerful and knows how he must defend himself. His Physic attacks do more damage than other aeons. He can reach to do a damage of 99.999 to the enemies without having any weapon.

	Name: Yojimbo
	Obtained: Cavern of the Stolen Fayth (you have to pay around 200,000 to 300,000 gil) (Optional)
	Special Attack: Daigoro, Kozuka, Wakizashi, Zanmato (depends of the amount of money that you give him and how)
	Overdrive: None
	Description: This rare aeon only attacks if you give him money so.... it's not cheap if you want him to do many damage. If you want to cause more than 9,999 damage on a enemy, Auron has to poses the weapon Masamune.

	Name: Anima
	Obtained: Baaj Temple (Optional)
	Special Attack: Pain (causes instant death to one enemy)
	Overdrive: Oblivion
	Description: This very powerful aeon can cause more than 9,999 damage without having a weapon of a Character. Although he is very strong he can't evade many attacks. His overdrive is one of the most potent Overdrives of the game.

	Name: The Magus Sisters (Cindy, Sandy and Mindy)
	Obtained: Remiem Temple (Optional)
	Special Attack: Kamikaze, Razzia, Passado.
	Overdrive: Delta Attack
	Description: If you want to have the overdrive of the Magus Sisters all three sisters must have the overdrive full. They can cause more than 9.999 damage without a character having a special weapon. If you want to obtain the Magus Sisters you first have to get Anima and Yojimbo and you have to defeat all the aeons of Belgemine in the Remiem Temple.