the effects of creatine should theoretically be more pronoounced while on gear than while off gear, and should definitely help you build muscle a bit faster, even on cycle. using it during pct and off cycle only makes sense on the sruface, but you might be entering pct with a bit less muscle than you would have had using creatine during your cycle, and i dont know if theres any reason to believe that a 'tolerance' builds up with creatien, so you should still get the same benefits from creatine during your pct and off cycle time if you used the creatine on cycle as wel as off cycle, instead of just off cycle, so the end result would be more muscle.