>>34758452That's too bad. But hey, at least Blaziken has a good special attack stat, so Timid isn't a completely awful nature for it. Granted, its special movepool is extremely shallow, so that causes problems.
Now, if you want to see an even worse nature for a shiny, check out my Blitzle. Sassy means reduced speed, which makes her pretty unusable. The worst part is that if she'd shown up just a few eggs later than she did, she would've been Jolly, because shortly after getting the egg that would later hatch into this Blitzle, I switched out the random-nature Zebstrika I was using with a Jolly Blitzle holding an Everstone.
For your sake and mine, I hope we'll be able to change Pokemon's natures in Gen 8, whenever it comes around. We can already modify ability and IVs, so nature is the next logical step.