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I used this in ORAS recently, since I couldn't get Metal Coat for my Scyther until after the main plot. It was hell catching the right Aron and then breeding them for the right moves + abilities, and the egg hatched after I got my fifth badge.
But he soloed Winona's Altaria and Swellow, despite being 12 levels behind her weakest mon. Then he helped take down Tate and Liza, and most of the E4. And in the post-game, he gets a ton of uses.
Little guy went from backup mon, to one of my star team members. Plus raising him from an egg and watching him grow made me connect with him more.