What's the easiest way to catch one of the legendary pokemon?

[AOBLXIX 10,970]

So, many people are getting frustrated with the legendary Pokemon and not catching them.  Do you have any tips/tricks that you use to catch them? 

[LtNoobslayer 849]

First off you need to get a group of 15+, this is mandatory for defeating the boss.  After that, it all comes down to golden Razz Berries, accurate throws, a prayer to R. N. Jesus and a lot of patience.

[Feisty 795]

I know this is an older post but there is a lot of ways to catch a legendary pokemon these days. We just got finished with an articuno raid day this last week, but you can get legendary pokemon by completing a week of research and everything as well. There are a lot more legedary pokemon appearing in gyms these days also, I managed to get myself a Regice, which i had never seen or heard of before i did this raid.