My friend told me that there is a place in emerald or johto where you can get a mews is this true or is it not.
P.S. he says he didn't hack and he dosn't tend to lie about pokemon but he is alot younger than me.
Mew is an event Pokemon, no matter what game it is...and without event item, you can't caught it! so, there is no Mews place (without event) like your friends said. your friend didn't hack it, but the game was originally hacked!
Well, you know that Mew is event exclusive Pokémon, so IMO, it's not true.
EDIT: there's a event-place in Emerald called Faraway Island. You need item called Old Sea Map