Just posting to say that I really love everything on this team: the presentation, the members, and your detailed description of their roles. It looks a great team, I can see some problems but listing them is redundant, my rate would look an exact copy of Jirachi's one: the main problem I can see are Rain Hydro Pumps by the likes of Keldeo and its friends. While K-B boasts absurd bulk, it's weak to Secret Sword and to hazards, and Starmie as pointed out will go down very fast anyway. Unfortunately, even switching to a Bulky Starmie doesn't help: Keldeo still 2HKOs with Specs or Rain up. I fully support Jirachi's LO Latias to handle Scarf Keldeo. The other suggestion (already mentioned, too) that I'd implement on this team is Fire Blast over Fire Fang on Chomp, basically for the reasons Jirachi explained in his reply.
Again, great team, good luck playing it!
Not accepting rating requests anymore. Sorry!