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Isn't magnezone kinda a threat to your team as well? It can trap your scizor and ferro. It's also not good for gyarados if you haven't D-Danced. Perhaps you can replace raikou with volt absorb thundurus since you dont have ground type so opponent can just click volt switch and gain momentum.
I suggest you run a bit of speed ev on the heatran in case of heatran vs heatran match up. So your earth power will go first and ohko the opposing heatran. 16 evs should be good.