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Except for Gardevoir, each of them is a (pentaperfect 4EM) great-grandchild of an Emerald bro of the same species.
Originally I wanted to use a shiny Bellossom bred from my Emerald Bellossom and FireRed Vileplume, but after scores of boxes I didn't manage to hatch a shiny in time for ORAS, so I used a Ralts instead. ;_;