i wont tell you anything i know!!!!!!!!

Although, it took about 20 tries of using that ball and it still works.

It worked for me for catching Kyogre.

I'd rather use the Master Ball on Latias.

in pokemon fire red i caught mewtwo(lv70) by only directly throwing ultra ball, without
doing anything else ^^

ik pokemon sapphire i caught rayquaza with timer balls, i used about 10 and cut his hp to
just under half.

i also used the masterball for latias...

get it in red then throw a pokeball if that doesnt work throw a great
ball!!!!!!!!!!!!!!!!!!

buying 10pokeballs over and over to get premier balls and used those and caught
him/her/it