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To be fair, when I find roaming legendaries, I tend to make their catch rates irrelevant. Go Master Ball!
Really? I hoard my Master Balls- I've only used one, and that was on Heatran in Diamond when I was soft-resetting for a Modest one with flawless Speed and 20+ IVs everywhere else. It was such a pain, I'm so glad I learned about RNG abuse eventually...
In any case, roaming legendaries are handled by my level 100 Smeargle. I temporarily have her Sketch Mean Look to compliment a moveset of Spore, False Swipe, and Substitute just for the running ones. Makes catching them so much more bearable.