Fusion Beasts do not appear in the enemy bestiary.
Ok this time its alittle more tricky because now the fusion monster has a higher defense and won't take much damage like last time. So I recommend you get the water fusion monster and use its special skills because it will cause like 100 points in damge and he will go down in a few turns. Be careful his special skills it may be annoying to deal with
Upon its defeat, the Ifrit fusion is unlocked.
Ifrit (or Efreet) is a creature of the Middle Eastern folklore, mentionned in the Qu'ran and the One Thousand and One Nights. It's a very powerful, destructive Jinn, often described as winged creatures made of fire. Even if they are impossible to subdue by brute force, they can sign pacts, as the soul pact with the Devil in the Christian culture. Some Ifrits may have a faithful personnality, but most of them are considered as cunning, and dealing with them rarely bring good luck.