When did YOU use your Master Ball

[Campanella]

Xerneas in Pokemon X, then never again and never before since I was too nervous about wasting them x)

 

[SableyePog]

I see you are new here! Have you made a thread introducing yourself yet?

 

[ThePokeCorral]

When I played Ruby back when it was the newest game, I had heard that Latios/Latias was even harder to catch then Rayquaza, and so it was best use the Master Ball on them. So, I did that, and resolved to find some other way of catching Rayquaza. My solution ended up being to freeze it, stall for as long as possible, then use a Timer Ball. 😂

Other than that, I think the only time I've used a non-hacked (*coughMissingnocough*) Master Ball was on Mewtwo in Gen 1.

 

[Elite Overlord LeSabre™]

Once I realized Master Balls were an awesome shade of purple, I'll hoard them and not use them except in games where I can get multiples of them. I suppose if I found a shiny I wanted, and exhausted all other attempts to catch it (or it happened to be one that can flee or explode), I'd be persuaded to use it.