for sederance, your letter is X.
You may only use pokemon in the family of a pearl gym leader's pokemon.
Once Volkner is defeated, you may only use pokemon used by the Elite Four and Cynthia, and pokemon in their families.
You may use a Crobat as a flier, but they cannot be used in a wild pokemon battle.
(As a bonus, you may not use a pokemon against a gym leader/league member if the gym leader/league member has it.)
The only exception is on Spear Pillar and the previous climb. You may use any pokemon at that time, but Crobat must be in every battle against trainers.
I'm SO SORRY that I've missed nearly the entire past month. Some serious stuff happened, and I'm really sorry to those here who were affected due to it. If I've forgotten anything I was obligated to do, PLEASE PM me.