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The Rock dogs are Corocoro EXCLUSIVE so they can't be shown in the video at all, at least for a week or so after Corocoros release, otherwise it's not an exclusive.
Also Corocoro hasn't officially come out yet so the info the the trailer will most likely not be the dogs.
Like how Komala and Rockruff were shown in corocoro but nothing was said about them for a couple weeks later.
My guess is Cutifly's evolution will be one of the new Pokemon shown (the trailer was no accident) maybe another new Pokemon and possibly an evolution.
Definitely another UB.
