Website and data research by 101Leafy.

The numbers for Siren are from the Game Boy Color version; the GB line lists what the Game Boy version changes. Skills in battle are what it uses against you, and skills as an ally are what it brings when it joins the party. A group of monsters may leave an item after the battle; the chance is listed under each monster.

Not met in fights or the story. The only way to get it is fusion, shown below.

Fusion

Made from

Pairs at starting levels that make it: 90. The lowest levels come first. Needs the leader at level 27 or higher.

Every pair in the calculator

Can make

What it makes at its starting level with the right partner. Hangman, Ctrice, Furiae, Yakshini, Rangda, Pairon, Loa, Aquans, Choronzon, Ushas, Badb Catha, Atsuyu, Wurm, Apollyon, Griffin, Gurr, Genie, Blue, Hydra, Phantom, Gorgon, Surt, Focalor, Flaemis, Senko, Vritra, Corpse, Centaur, Hanuman, Manticore, Jabba, Legba, Onkot, Ekimmu, Gomora, Orobas, Crow, Kelpie, Ananta, Isora, Churuluk, Shakara, Ukobach, Lakcharango, Basilisk, Gayle, Yaksha, Atlas, Qing Long, Aello, Hou-Ou, Nue, Samael, Larvae, Nata, Kalika, Salmand, Garuda, Element, Wraith, Hibakara, Serpent, Golem, Roc, Unicorn, Legion, Mintaur, Alcyoneus, Tiamat, Barong, Wyrm, Mara, Girimehkala, Thor, Fafnir, Wyvern, Jinn. Every pair in the calculator