You're missing the Sylph summon, for one.
As for the three others (Cocatrice, Bomb, Mage), some of them were dummied, so depending on the version you play, you might not be able to acquire them.
I know I never bothered acquiring them myself. I think I only managed to get imp once, and I was not even trying (like, my 2nd battle ever with Rydia in my party and I won the Imp item that taught Rydia the summon). |