Hey. Just a bit of clarification as to why I recommended Celebi over Breloom: the given Speed EVs allow it to outpace all forms of Mamoswine, and Natural Cure gives your team an answer to certain forms of debilitating status. NP Celebi can also be used to weaken Jirachi's counters, easing Jirachi's chances for a sweep.
I just wanted to make a few points clear, but again, you don't have to use Celebi. You've made a great team, and I just want to make it better. Have a nice day / night!