...Leafeon also helps with Swampert, as taking him out could be a problem and he could just haunt Dragonite all day long.
Leafeon is also a great Gyarados counter, as Blissey is a rather bad counter.
...
HP Electric Vaporeon.
Celebi. Leafeon is a decent idea though.. His HP is a tad low.
But I just feel that Celebi might not go well with Jirachi. Bronzong and Jirachi together indeed does not feel right.
Cresselia maybe. HP Electric Suicune or something.. Or maybe you can use Bronzong but put HP Electric Vaporeon over Jirachi.