Hmm... My fav legendairy? *checks trainer card*
I like articuno.
As for the legendairys I have caught? In LG i have:
-Zapdos: Caught this one in preperation for the E4
-Articuno: Caught this one soon after (favorite poke)
-Raikou: Found this one luckily just after the E4. Used my masterball.
-Moltress: Caught it after plenty of tries.
-Mewtwo: My last Legendairy Catch. Timer balls work well if you keep switching.