have you ever caught a legendary...

[0^2]

I caught a Mewtwo from Blue Version in a Poke'ball.

 

[RuNNing Riot]

Update! Alright, guys, my sister's been working hard on her path of warmongering since I last posted, so I'll just give you lot the heads up. All of these bar Darkrai were caught in a standard Poke Ball. Darkrai himself was in a Premier ball, which is the same strength as a standard one, so I'll list him anyway.

Articuno
Moltres
Zapdos
Mewtwo
Suicune
Lugia
Ho-oh
Regirock
Registeel
Regice
Latios (caught not ten minutes before time of posting!)
Kyogre
Uxie
Mesprit
Azelf
Dialga
Palkia
Giratina
Cresselia
Darkrai

And that's it. She apparently forgot Heatran, it seems.

 

[SpiredMoth]

She also forgot Regigigas.