From my experience 3 Rain Dancers are absolute MINIMUM. I'm using 4 in my team and I saw in one of RaikouLover's team using 5 of them. +SpDef Tyranitar is good enough reason to have more then 2 Rain Dancers. Stay with those 3, it will be fine if those pokes are bulky enough.
Your lead is fine - right now Electrode is the best choice to start Rain Dance and he do that job quite well. Jirachi looks fine, with Kingdra use Rain Dance. It's bulky enough to use it effectively so it's fine, especially when your Ludicolo isn't focused on defences (which is even more important on that Kingdra). With Draco Meteor you don't need that Outrage to be honest. And Bulky Waters focus on physical defence anyway, so you'll hurt them much more with those Draco Meteors without Dragon Dance.
CBPert is interesting idea, but there's always the risk that ur gonna use Waterfall on hard resistances (like Vaporeon or Ludicolo) wasting those precious rain turns. Someone had here good suggestion - Life Orb Azumarill or SubPunch Azumarill would be good idea to help to abuse his huge attack and his priority with Rain Dance is on Scizor's CB Bullet Punch level.
Scizor is fine I guess, I like that set to be honest. But if you like to use underrated pokemon, here's my suggestion, if you need something bulky and having ability to scare of those auto-weather changes and get rid of Blissey (and Bulky Waters if you have ThunderPunch). About who I think ? Simple - Hariyama. I'm using standard "Defensive Hariyama" with Force Palm spread from analyses, but in place of Knock Off Rain Dance. It works fine for me, maybe you'll like it.
With that team I see a little problem - but it's not that often, so I think it's not that troublesome - Toxic Spikes. Most of your pokemon won't enjoy being poisoined, especially against well built stall teams. If you meet heavy stall with poison, you may have some problems. I think that only pokemon, which could help with it is SD Qwilfish, but I'm not sure who could you replace here. But if you don't have that problem, than don't use it ;).
But I need to say that your RD team looks solid and have methods to go through Blissey and bulky waters, pokes which are the biggest challanges for any RD team. Congratz, I like that team. Cheers.