Yeam IMO Mix Mamo should be Naive as you don't get the power boost needed on Blizzard to 2HKO things that you want to with it. And Anti is also right about Blissey if you are running protect, why not Wish anyway? That way you will still heal your self, but you also have the chance to heal your other team mates, in fact every one of your team mates will like the extra recovery so that really is a must for you. I can think of a minimal number of situations where it will be worse off for you. But you can pull it off quite easily. Bring Blissey in on a special attacker, wish on the switch and then switch Mence into the physical attack, (often fighting type). You get the intimidate on it you get fully healed as well. The you are free to unleash a Draco Meteor. you can do the same with scizor on suspected Outrages. Hariyama and Swampert also cant heal themselves and will be happy for the Wish boost.
You seem to have the main counters for scizor covered. Other Scizors you can deal with with Blissey (to an extent) and also swampert, your own scizor can finish it off to and Mence can intimidate. Zapdos will be dealt with by blissey, Swampert, Hariyama etc... although I suggest not keeping Swampert in the first time, HP grass is becoming more common. Can I suggest Ice Beam on Swampert? It will allow you to hit Salamence harder after an Intimidate, and you should have relaxed nature with that.
Apart from that it seems cool, but if you are having any specific problems then come back and say, it's easier to rate that way. Good Luck with your team!