I use it if I run into Lati@s.
I'll usually use it on something random. Snorlax was who I used it on during my last playthrough. He's always a pain to catch.
The only time I've ever used my master ball was on XD 001, just because I didn't want to have to come back to catch all of Greevil's pokes.
I have never used a Master Ball on any Pokemon. I will always try and catch them with other PokeBalls. Like the other day I caught Zekrom in a Quick Ball on Black 2...or even XD001 in a Great ball on XD:GoD
All my Master Balls have been used on shinies, which would comprise a grand total of...one.
Having to chuck 99999 other Poke Balls at a roaming legendary is nothing compared to the potential pain of losing a shiny because it might teleport, or explode, etc.
The only exception is on Greevil's Shadow Lugia in XD, but ONLY because it is impossible to encounter a shiny in that game.
yes i used mine on raikou i after i caught ho oh
Hell ya I use my master ball! I use it on everything!
i try not to. but if i can't catch the legendary, there's no choice for me but to do so
on an pokemon white, i've catched zekrom with a pokeball, i didn't catch any other legendary pokemon so i still have my masterball, i never catched a legendary because i have a hydreigon of lvl. 100
I always use my master balls on shinys. So I'm sure that they won't get away!