Here are the list of Eidolons in Final Fantasy IX. A useful tip do not sell away the add ons for each summons. If you have any question drop a message at the contact page. Enjoy!

ARK

Ark is the bringer of Darkness in this game. You will meet Ark for the first time as a boss and then you will acquire him very later in the game. He appears to be in the shape of a boat but as he transforms into a huge machine of death, you will now know why it took so long to get him. He flies from the Red Moon and transforms when he locks-on to the enemy. Then he fires multiple lasers that explode on impact. Then he uses his final beam, which causes a massive explosion so big it can be seen from space.

Attack: Eternal Darkness
Element: Shadow
MP: 80
Learn from: Pumice
Character: Dagger
How to get: To get Ark you will need 2 Pumice Pieces. Then you will need to find and defeat Hades at Memoria so he will Synth them together to make a Pumice.

ATOMOS

Atomos is a huge Eidolon with a mouth big enough to eat a city. He charges his energy within his mouth and then shoots it at the enemy. The energy engulfs the enemy and implodes with it inside. Atomos is a great Summon to use.

Attack: G-Force 199
Element: Shadow
MP: 38
Learn from: Amethyst
Character: Dagger
How to get: You will get your first Amethyst from Doctor Tot.

BAHUMUT

Bahumut the King of Dragons. When you Summon him he flies at a tremendous speed from the sky and flies past the enemy making a gale almost knocking them over. Then he flies up and charges his attack then fires it down onto the enemy from above causing a huge Non-Elemental explosion.

Attack: Mega Flare
Element: Non-Elemental
MP: 56
Learn from: Garnet
Character: Dagger
How to get: You will get the Garnet after you go back to Alexandra on the
third disk, I can't tell you much more without spoiling the story.

CARBUNCLE

This cute little green Summon will cast a protective spell on your whole party
depending on what you have equipped. Once you have learned the Carbuncle from a
Ruby then equip a new Add-On. Then when you summon Carbuncle he will use a new
type of attack. Read the following table to see the new types of attacks and
the Add-On you need to equip to use them. But you will need to keep the Add-On
equipped while you are attacking in battle.

Attack: Ruby Light,
Element: Non-Elemental
MP: 24
Learn from: Ruby
Character: Eiko
How to get: When you first go to the Iifa Tree you get the Ruby from the
invisible wall.

FENRIR

Fenrir is an evil wolf from the underworld. With a howl he summons a great big monster that punches the enemy so hard that fly up the sky. There is also another attack that Fenrir can do which is called "Millennial Decay 1000 Year Gust" which does Wind damage to all enemies. Read the table below for the item.

Attack: Terrestrial Rage
Element: Earth/Wind
MP: 30
Learn from: Sapphire
Character: Eiko
How to get: When you get Eiko she will already have the Sapphire equipped to her.

IFRIT

This Eidolon will dig its way out of the earth and then summon up the flames of hell and hurl them at the enemies.

Attack: Flames of Hell
Element: Fire
MP: 26
Learn from: Topaz
Character: Dagger
How to get: You will get your first Amethyst from Doctor Tot.

LEVIATHAN

Leviathan was a huge serpent that lived deep within the ocean in Hebrew mythology. And there was no man-made weapon that could pierce its scales. But the only weapon that could was a weapon forged by God. In Final Fantasy IX when you summon Leviathan he will appear in the ocean and then fly over the enemies and cause a massive tidal wave that slaps the enemy in the face.

Attack: Tsunami
Element: Water
MP: 42
Learn from: Aquamarine
Character: Dagger
How to get: You will get your first Aquamarine at the Iifa Tree.

MADEEN

Madeen is one of the strongest, if not, the strongest Eidolon out of them all. She summons up a huge globe of Holy Magic and pushes the enemy into it causeing a huge explosion.

Attack: Terra Homing
Element: Holy
MP: 120
Learn from: Ribbon
Character: Eiko
How to get: You will get your first Ribbon when you complete Mt. Gulug.

ODIN

Odin is a great Summon to have. Has when he comes down on his horse he uses his
lance and cut the enemy in half. This will kill the enemy instantly. Problem is it won't kill bosses, so don't get your hopes up. And also, there is a chance that the attack will fail and miss the enemy. But there is another solution. If Zantetsuken doesn't work, you can learn an ability that will make Odin to draw his sword and slash the enemy, causing damage. To learn the ability Odin's Sword just equip the item, learn it then have enough ability stone to equip Odin's Sword. Learn Odin Sword from acient aroma that can be found in a crack at the seaway canyon.

Attack: Zantetsuken
Element: Non-elemental
MP: 28
Learn from: Dark Matter
Character: Dagger
How to get: Get your first Dark Matter from the Treno Auction House.

PHOENIX

Phoenix is a huge rainbow bird that is born from the top of a tree then it lives for 500 hundred years. Then it makes a nest and burns itself alive when its ashes form a new egg and a new Phoenix arises. In Final Fantasy IX Phoenix will engulf the enemies in a huge wave of flame then he revives al the KOed members of your party.

Attack: Rebirth Flame
Element: Fire
MP: 42
Learn from: Phoenix Pinion
Character: Eiko
How to get: You can get Phoenix Pinions all over the game, just save one when
you won't to learn Phoenix.

RAMUH

Ramuh will appear from the clouds and throw down his staff, which will plunge into the earth in front of the enemy. The staff acts as a lightning rod and a huge lightning bolt hits the staff, which causes an electric explosion.

Attack: Judgment Bolt
Element: Thunder
MP: 22
Learn from: Peridot
Character: Dagger
How to get: When you have collected all 5 parts of the stories then tell them
to him in order he will become your first Eidolon.

SHIVA

Shiva appears and then throws some small icicles into the ground below the enemy and then huge pillars of ice arise and then shatter on the enemy, doing lots of damage.

Attack: Diamond Dust
Element: Ice
MP: 24
Learn from: Opal
Character: Dagger
How to get: You will get your first Amethyst from Doctor Tot.