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I finally banned Reshiram, Deo-N, Kyurem-W, Groudon, Lugia. They have good stats, good abilities, they are simply too strong and overcentralise the meta. Live soon.
I know this is like, really late, but Deo-N is still legal:
I entered a Groudon, Arceus, Reshiram, Deo-N, Lugia, and Kyurem-W (ignore arc) team to test which ones of the last ban wave were left unbanned, and it appears that Deo-N slipped through somehow. The Immortal