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I remember when I was a kid and got this game, I'd use them a lot. After my first playthrough, I only used the really good ones like Cerberus, Cactuar, Doomtrain, Eden, and maybe Diablos if he was level 100.
Now I find that I don't use any of them besides maybe Doomtrain just for the Meltdown effect, and only since I usually don't have Magic junctioned otherwise I'd just use Meltdown instead.
Speaking of which, I also stopped using Magic after my first playthrough outside of maybe Aura, and never the option junctioned unless I knew I was going to use Aura, like against Ultimate and Omega Weapon or the final boss.
Shiva for Fire Cavern and while grinding as Seifer (only for the 2x Anacondaur and only until Seifer is stronger) Queza for X-ATM092 if I didn't grind with Seifer too much Carbuncle/Cerberus for general utility
My channel with random game videos https://goo.gl/G7wg15