I don't believe so. I have observed several 'shiny' Pokémon and none of them have seemed to be in any kind of distress.
As for your Aggron... my Decidueye spent almost thirty levels longer than he had to as a Dartrix. Some Pokémon simply evolve late for whatever reason. I believe evolution is not merely dependent on level but also to some extent on the maturity and willingness of the Pokémon in question.
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As for your Aggron... my Decidueye spent almost thirty levels longer than he had to as a Dartrix. Some Pokémon simply evolve late for whatever reason. I believe evolution is not merely dependent on level but also to some extent on the maturity and willingness of the Pokémon in question.