This is actually a pretty solid team, but for Rotom-H, if you are considering Pain Split somewhere the best place would be >>> Overheat, because Overheat makes you complete Pursuit bait to ttar after a sp.atk drop. i know you can burn it but you can't really do anything else and if you miss then you will be screwed.
I'm looking at ttar to be a threat to this team. It sets up one DD against any of Jirachi's moves after Scarftar is down and it will hurt you a lot. You could phaze it with Swampert but eventually you will lose due to Swampert's lack of recovery. To fix this, I suggest an anti-lead Machamp over your current Dragonite set. You lose the synergy with Jirachi but you still have a hard-hitting anti-lead and you deal with ttar a lot better.
I have retired from competitive battling after a (not so) successful two years. I might check back up here on occasion so if you want me to rate then drop me a pm but try not to get your hopes too high :/