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I really don't think the introduction of fairy type pokemon will stop the rain of the dragon because like all pokemon you can just overpower the other pokemon like for example I was battling a lvl 100 samuarott with a lvl 100 blaziken I lost but using one FIRE type move I destroyed over half...
There should be no ban list because witch are you going to spend more time on a common pokemon like bedoof or a legendary like Zekrom. So in any case if we could use all are pokemon without qeustion the online battling would be alot better and wholike having to use only three of the six makes...