In Pokemon FireRed version how do you get Mewtwo?

You can't obtain Mewtwo in Pokemon FireRed version. Mewtwo is exclusive to the original Pokemon Red and Blue games.

Here's why:

* Different Game Mechanics: FireRed and LeafGreen are remakes of the original games, but they have different game mechanics and features.

* No Cerulean Cave: The Cerulean Cave, where Mewtwo is found in the original games, does not exist in FireRed.

To get Mewtwo, you would need to play the original Pokemon Red or Blue games.

There are, however, ways to get a Mewtwo in Pokemon FireRed through other means, such as:

* Trading: You can trade for a Mewtwo with someone who owns a game where it is obtainable.

* Cheating: Some methods allow you to "hack" a Mewtwo into your game using external tools.

Remember that cheating is against the spirit of the game and can potentially ruin your save file. It is best to obtain Pokemon through legitimate means.