You can't catch a Mew in the wild. You'll need to trade for it or use the Action Replay.
yes
An event
yes
you can't
Mt.Moon
Mew can't be catched in Pokemon heartgold, only mewtwo.
You catch Mew-Two
You cannot catch a mew. You can only get it through events or cheats.
You can't catch it at Pokemon Pearl, you'll have to Transfer it from LeafGreen/FireRed or trade it with SoulSilver/HeartGold
you need action replay go to youtube to get the code
u cant but you can get mewtwo in cerulian cave at lv.70.
U can't in heart gold but u can catch mewtwo