I have absolutely no idea what would happen if I hatched an egg from Ash and Copper...
Because, well... here's Ash:
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And here's Copper.....
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Utterly and completely different. Ash looks like... well, a muddy blue Colombian... and Copper's sort of chocolate partridge-ish. I think I'd get a mystery.
When I say I don't think Copper's gotten the job done... I mean just that. He's got the 'hop on the back' part down well enough, now, but every time he tries to get back near her tail he falls off and she wanders off in disgust.