Board Thread:Tips, Tricks, and Questions/@comment-32463712-20170703005039/@comment-11394256-20170703011949

If you have the space in your storage, I'd suggest keeping them. You might be able to get a second one later to evolve, or find they have a zodiac that fits with some others. (If nothing else, you can at least send them on missions)

If you're low on space and really wanna get rid of them, I'd recommend salvage. Feeding is only good for XP and boosting passive abilities, and you can do that with rare or common monsters.