You don’t have to catch all the Legendaries now, but they all make fine additions.
Besides 
Latios/
Latias, your cover Primal (
Groudon and 
Kyogre), 
Rayquaza and 
Deoxys, who you’ll all meet during the course of the main story, there are a bucketload of other Legendary Pokemon to catch, most of which are available from Mirage Spots.
The capturing techniques for each are much the same. For the most part, you’ll want to status them - preferably with Paralysis - and then use moves like False Swipe or Hold Back to slowly grind down their HP to just 1. (It will take a long tme for 
Regirock and 
Registeel, but it’s better than making them faint.)
From there, mostly just toss out Ultra Balls, or preferably Dusk Balls when it’s night time. Though, even at 1 HP and ailed, it will probably take a while to snag the Legendary. If the battle does begin to drag, switch over to Timer Balls instead. Basically, be sure to bring lots of items!
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