I'm really good at getting legendaries down to almost 1 HP and catching them with Pokeballs or Great Balls. In Leaf Green (when I knew where it was) I had caught Zapdos, Moltres, and Articuno with a Pokeball. I caught Mewtwo with a great, and got Entei, Raikou, and Suicune in Pokeballs also. (I used the training method, and yes, I really did restart the game three times just to get all the legendary dogs from Johto.)
In Sapphire, I managed to get a shiny Rayquaza in a Pokeball, which was my rarest catch ever. Groudon and Kyogre where in Great Balls (I played my friend's Ruby to get Groudon, same with Latios). Lati@s was captured in Pokeballs.
xD I fel speshil.