If the feebass's sheen is full you wont be able to evolve it so i wouldnt do that trade if i were you.....
I have like 36 wiki berry's and a couple Calm feebas left i can evolve you a milotic really easy if you can wait like 10 min for me to make the poffins.
I also can catch you a steelix if you want there easy to get.
I dont need anything really. Do you have like Ice Beam/Thunderbolt/Flamethrower ?
Or any good TM's you might trade ?