a -atk +def Delthea

No, i don’t rly see this working, her main point is to have a lot of attack

Even if she doesn't have an optimal IV I would use her as a buffer. Mine is +HP/-Spd and isn't optimal either, but with swordbreaker is able to anhilate every sword user, and can buff brave weapon users to deal 9 damage more in each hit. Therefore, if you don't have a Linde with Dark Aura, I would keep her and use her a a buffer.

Mine has the exact IVs.