I'm gonna sound like I'm parroting everyone else, but there's a very good reason for that. It's because what everyone says is true: Cresselia is broken. It was too broken for RU twice before, and that has not changed this time around. For the third time in a row, it frustrates all of its opponents by flawlessly walling 95% of the tier. What's worse, it employs sets like Calm Mind and Sun support to readily skate around its "counters" to the point where they can't even be called counters.
And on a more personal note, I am not surprised by any of this. The only part of this that surprised me in any way was that Cresselia was let back into RU again after its aforementioned history of broken-ness. "Are you freakin' kidding me!?" is what ran through my head when I first saw this.
Ban this thing. And never let it terrorize RU again, please.
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