Level 70 rayquaza in a regular poke ball.
EDIT: It seems people are confused. Is the link not working?
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I was fighting Yveltal, and forgot to buy Ultra Balls. I sighed, and thought "this is gonna take a while". Caught him with my first Great Ball. I actually thought it was guarantees, lik Rayquaza in AS, until someone told me otherwise. :p
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It's OR/AS, right? [spoiler]If so, not that impressive. You could catch that Rayquaza with your bare hands.[/spoiler]
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I caught a Regigigas with a Normal Ball in BV2...and a Rayquaza with a Normal Ball (and Deoxys) with a Normal Ball in OR.
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[quote]From my senior year of high school. (Yes, I know I sound much younger, so please don't throw doubts at me)[/quote] What does that even mean?