PvP are a paper-stone-sicser game with Moe-Babe-Sexy I hear. Each player start with 5 girls they have selected. Each turn players selecet a girl each if both players chousen have same type the girl with higest power win otherwise type desides winner. So with luck 5 N-girl can beat 5 SR-girls. Maybe each turn the girl that Looses is removed from game and game go on untill one player have no more girls to play.

In PvP players just need 5 SR-girls and it is not so hard to get 5 SR-girls to level 100.
Power only go up a few points for each level after 100 but that few points might matter a lot in PvP.
That might make Ex-Wild really usefull.