you have to catch it in Pokemon emerald. to catch it in emerald, you have to have the old sea map (event item). then talk to Captain Briney and he will take you to faraway island. then, mew will run around in the tall grass. eventually when you catch up with it, you will be able to capture it.
There is no such thing as cursed mew.
There is no such pokemon as Mew-Three. But there is Mew and Mewtwo.
It isn't possible to catch mew in Pokemon diamond. You need an action replay cheat cartridge.
Unless there is a mystery gift using wi-fi or from a store (would be posted on the Pokemon site) you cannot get mew in Pokemon Diamond
You cant get a Mew without hack
Mew cannot be caught in the wild in Pokemon Diamond and Pearl. You need the action replay code.
cheat
Trade.
in the old games of pokemon
By trade.
mew
The only other way to get a Mew in Pokemon Diamond is through a Nintendo Event or a Trade with someone who has one.