i know u probably are like no crobats b/c of what i said, but crobat does have high speed, and can definetely use attacks that are psycial very well. ortherwise just use a sharpedo. even tho no swift swim it has good speed, good attack and sp attack and with moves like earthquake, surf, ice beam, and crunch, it can definetely clear its weaknesses (for water at least and bug too) and totally 1hko ghost and psychic types! even tho it has super low defs, u can easily give it a good item, ie bright powder, inorder to help it survive. rough skin could possibly help too if it will surive it.
*notice i didnt make fun of you or anything when u made a mistake, also i checked serebii b4, but didnt say to you about the ninjask, i didnt want to ruin your confidence... maybe i should have,but i thoguht it would be mean... sorry if u thought i should...