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From the sprout tower at night.
Crystal is a GEN:2 game while Latios is a GEN:3 pokemon. (so no)
You can catch Chansey in Pokemon Crystal on Routes 13, 14, and 15.
yes, after you beat the pokemon league if they are on a swarm.
in some cave
Yes - Route 44
you catch latios in the dragons den after defeating claire, you get to choose either latias or latios
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.