I never use them. I just let them sit there in my inventory.
I always use mine on the roamer, and because I have Black, that means I used it on Tornadus.
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I actually caught Landorus on white version with my Master ball because I was impatient and I just wanted to get it without working too hard.
I never used mine because I will only catch my pokémon in a pokéball and nothing else. How do you think I caught Zekrom? A pokéball.
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Zekrom is set in the game so that you have to catch him before the fight with N so that it can catch without the slightest problem with any ball XD but I agree that if you know how to catch Pokémon well as master ball just does not apply and you really will just take up space in your inventory i remember now how i use master ball to catch Latias in my White Version 2, the reason was simple Latias still used the recovery attack sleep and I've tried (psychical types can not even sleep I think) I did paralyze so with whom I have had the power and used the master ball XD
My n.1 Pokémon from Generation V rly very much love Hydreigon
Thundurus. I always use it on a roaming pokemon.
I have Pokemon White 2 of the Generation 5 games, not sure if this is the right area to post this. However I still have 2 MasterBalls in this game and have not use even 1. (One from a scripted event and the other from beating that scientist that was helping Team Plasma. Beating him again after Team Plasma has lost and they are on I think route 17. If you win you get a MasterBall, not sure how many times that is repeatable).
In Black, haven't used it yet.
In White, I think I still have it...
Gen. 6 winning teams:
, , , Clawitzer, Delphox, Xerneas
, , , Avalugg, Talonflame, Greninja