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If you're talking about battler sprites, they just go in the battler folder. If you're talking about walking sprites, they belong in the characters folder. If you're talking about something else, you're not being clear enough.
well, i tried both of those, and it didn't work.
i was talking about importing actually creatures you can fight.
so i could import a monster, and then fight it with my character.
Battlers are graphics. Monsters are Graphics + stats. You can make monsters in the Enemies tab, in the Database. After that go to the Troops tab and add your monster to a troop.