Mew was only obtainable in the original games through special events, often requiring specific codes or specific versions of the game.
If you are looking to find Mew, you may want to consider:
* Trading: You can try trading with other players who might have a Mew.
* Emulators: Certain emulators allow for the use of cheats, potentially enabling you to acquire Mew. However, this method is considered cheating by many players.
* Pokémon Brilliant Diamond & Shining Pearl: While still unavailable through regular gameplay, you might find Mew in these remakes through future events or special distributions.