No one really knows exactly. Probably in their own world, they do not like iron and earth having cars an all, is full of it, so they probably don't come here that often (unless they must for different reasons). Also, seeing as they have never really been proved, there is little or no evidence to say where they are, if anywhere.
You can catch it at Mt. Coronet.
u can catch: nidorina nidorino jigglypuff clefairy i dont remember the rest
no you can not catch evee in pokemon yellow but someone will give it to you
You can't catch a Clefable, since you have to use the Moon Stone of Clefairy to get it, but you can do that, or Catch it with a Ruby etc. game in.
Meowth is not in the wild in Pokemon Yellow. You have to trade to get it
mewtwo
You cant get Clefairy. But you can trade with someone who has clefairy.
no
catch it
You can catch a Growlith in the Pokemon Mansion on Cinnabar Island.
No you can't catch Mewtwo in Pokemon silver, you must trade it from Pokemon yellow.
to my knowledge,you cannot catch a dragonair in yellow version, but you can catch dratini in the safari zone