In pvp try to battle against people who are weaker than you and activate unlimited skills before going into battle then when your character gets to use his ultimate cinematic during that period just deactivate the unlimited skills and you'll probably win
thanks, starting to learn how to level to rank 30 faster, if rng is terrible an you dont have a crystal link character do uraharas frenzy mission, chance for a 4 star urahara who has crystal link, course i guess thats old info.