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Well i can guess why i see the rally up, im mean having to see groudon in D/P series is kinda weird since its not a legendary thats involve it. Buts just a nightmare with mismagius anyway :P
It's more that I think since its a nightmare that involves things they have seen. Thats why Dawn I think is versing her mother(Probably going to lose ina contest), Ash is versing Shirona (Who I think is magically using legendaries who they have had terrible encounters with) and Brock is beign posion jabbed by Joys and Jennies with Croagunk faces.