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
a cat
you need headbutt from the guy in azalea forest the headbutt the little trees till you find one HINT certin trees have diffrent Pokemon
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.
no he does not evolve in Pokemon hg or ss
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.