Karla with bad IVs

If you don't plan on building her then fodder. However, you can replace her weapon with Slaying Edge with Spd refine to mitigate the -spd bane, but you would score less in arena.

37 spd still isnt bad and with linus coming, just give her brazen atk/spd and the phantom spd seal and for the B slot she can still run desperation but if you find her lacking ia bit in the spd department still, then vantage isnt a bad replacement