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Claydol could be a better option than Regirock, Rapid Spin is always good.
Most of the time, you will be more concerned about your sun and most likely not have an opportunity to rapid spin.
A quick comment, not sure if its actually good.
If you dont want registeel to be screwed by fire attacks from the common moltres lead, i'd recommend swapping of of your other team members for a fire type with flash fire.
you might want to lengthen you description of you team, because the moderators will lock you thread as you are using one liners like: "My Bulky Sweeper. He is very strong and can also take hits."