[@XxFellsingxX]
Level one of exhaustion is disadvantage on ability checks, so only one roll is effected. However, if you wanted to avoid that, Flicker can spend one point of ki to counteract the disadvantage or two points of ki to roll with advantage. The attack roll and saving throw can also be made with advantage if Flicker spends a point of ki on both/either of them.

[@Lurking Krog]
Go ahead and do that.