Got mine with Diamond/Athletic, but as far as I can tell you just need Red/Blue colors (when they come out again) in the combo.
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Make sure you post when you decide to breed the two. With pictures. It will be interesting to see.
Penqueen2 said they got a magic when they bred them together, I think. Maybe the game thinks of them as red and blue when breeding.
Wasn't there a time when Tl was highlighting magic through pop ups. Wonder if this is related.
Is this just for ISO? I just got Diamond on my other account and will try tomorrow and post what I get :)