You cant catch Articuno in Pokemon Crystal, only in Blue, Red and Yellow. But i am not sure about that.
no.
You can only catch Zapdos in Crystal by cheating. otherwise it is not in the game
I wouldn't. I'd catch your stupidity.
you don't catch articuno in crystal but you can get one from red, blue or yellow.
catch it in the wild
You cannot catch Mewtwo in Pokemon Crystal, but you can trade it from a Pokemon Red or Blue. Hope this helped :)
you catch it at night
First, you have to find them, then, you have to battle them, then, you catch them.
you cannot catch a Pokemon that is already owned by another trainer. you can only catch wild ones.
You could get a shiny Pokemon for crystal but you need luck to catch one ("_")
you cant catch missingno but you can send it from red and blue I'm pretty sure but it wil turn into a ditto i think you can also catch glitches on Pokemon crystal.