Who do you use the Master Balls on?

[Diversion]

FireRed: Suicune
Crystal: Raikou
Platinum: Zapdos
SoulSilver: Latios
Emerald: Latios
White: Thundurus
Black 2: Kyurem

As you can see, I mainly use it for roaming pokemon.
But in B2 I used it on Kyurem, because I had no choice.
It was extremely hard to catch.

[Golden Warrior]

Yellow: Mewtwo
Silver: A roaming legendary, can't remember which.
Sapphire: Kyogre
Diamond: Giratina
White: Thundurus, if I remember correctly.

[★Hoenn★]

Nowadays I never use Master Balls, but I frequently used to used them on roaming legends in each game.

[Pikapia]

SoulSilver: I haven't even got it yet!
White: I stupidly used it on Zekrom, because I didn't have enough PokéBalls, and so, I wasn't prepared (even though I knew it was coming).
White 2: I haven't used it yet, and I might not! It really depends on the Pokémon's catching difficulty.

[Yoshistar64]

YO I remember when I was like 6 and playing Gold, I used my Master Ball on a Zubat because I didn't realize the significance! I totally got yelled at by my older friend.

But these days, I NEVER use a master ball. I know it's a freebie, but since I consider myself a pretty good Pokemon collector, it just feels like a bailout. For whatever reason, using a master ball feels shameful, and I feel like I would look at the Pokemon that I used it on with a kind of disappointment.

Also guys take this advice from the man himself

Originally Posted by PsytronicX

I remember accidentally using it on a Doduo back in Gold the first time I got it.

Originally Posted by True Epicness

It's like the Queen in chess, I feel it's so valuable that I need to save it for something really worth it, then I never end up using it.