The coaching stats are without clothing items. As all practise stats are. And all girls have 20% bonus, that counts as clothing bonus.

The plan is, to do 15+ wins with your best girl. And then get one after the other to her level and get 15+ wins with them.

All the while hoping, there will be enough diversity or a game change, so you will encounter enough different girls. Right now you only do challenge against the best girl of your opponent.

It is unknown, how the event girls will be treatet, when their event comes again.