Well, first off, you must defeat all gyms and all the elite four, then you go onto a map, and hunt them! You should find them in 30 minutes to 1 hour and a half (Maybe even every 1000 steps)
If your still having trouble, I will give you a free legendary, called 'Moltress'
Pokemon Vortex account name: xCroat-
MSN: nikstevanja@live.com
P.S. All legendary Pokemon can only be caught by a masterball
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It's simpler if you buy a Masterball and have high stat Pokemon.
yes you have to defeat all the champions before catching a legendary pokemon
it is legendary
Ionno.
you have to get more then 45 gym to catch legendary Pokemon! deoxys is a legendary Pokemon