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I used it on Thunderus, because depending on the game, Roaming Pokemon can be really awkward. Black and White were particularly awkward in this regard, in my opinion, so I just used the Master Ball on Thunderus to get it over with.
I still haven't used mine on Black. I think I'll save it for whenever I battle Kyurem. I've planned to soft reset for a shiny Kyurem, so it's fitting that it has the best Pokéball (and I don't want to KO it, of course).
I haven't used it yet and it will very likely be a long time if I ever do because I'm reserving it for a shiny. I already got my roaming legendary thanks to a sweet deal on the GTS.
I never use my Master Ball. I insist on using Poke Balls (teehee, balls) on everything all the time.
...which is why I'm wasting time trying to get that stupid Thundurus :C
I used my master ball on Kyurem. I didn't know what to use it on since I had already caught every other legendary Pokemon available in Pokemon White (except Landorus). I don't walk in the grass much to encounter a shiny Pokemon anyways. lol
I'll use the first one on thundurrus, and the other one you get from trading on the other roamers. all other legends will be caught with normal balls (hey, i even caught my Zekrom in a poke ball, first throw, too, so Im not gonna waste a master ball on a stationary legenadary.
i just used it on tornadus.. It's always been a horror to catch a roamer.. ever since the experience i had with latios in ruby, i will always use a master ball on roamers.
You should have made an exception in that case, because Reshiram and Zekrom have a catch rate of 45. That's the same as Deino. Volcarona is 3 times harder to catch with a catch rate of 15, and he's not even legendary.