How do you get Mewtwo you get in Pokemon diamond?

Answer 1

In order for you to get Mewtwo in Pokémon Diamond you have to migrate it from either Pokémon Ruby, Sapphire, FireRed, LeafGreen or Emerald via Pal Park (Route 221). Mewtwo will be wandering around in grass areas inside the Pal Park.Its pretty borring to migrate)=
Use Pal Park to migrate it from FireRed or LeafGreen or trade for it from HeartGold or SoulSilver.
there is a way you have to trade with someone or migrate it!

if u have a ds put da game Pokemon FireRed and migrate u have to have pokedex national to do tat and area 201 somethang like tat
You need to migrate Mewtwo from an earlier game in the Pal Park.

You can capture Mewtwo in Pokemon FireRed and LeafGreen then with FR or LG in the GBA slot you start diamond and a new option should be in the menu before you start the game for you to migrate from FR/ LG (max of 6 Pokemon per GBA game per day, the Pokemon can hold items however can not know any HM moves).
In order for you get Mewtwo in Pokémon Diamond you have to migrate it from either Pokémon Ruby, Sapphire, FireRed, LeafGreen or Emerald. If you have a friend that has one of those games and he/she has only one Mewtwo then you could tell your friend to put Mewtwo in an empty PC Box. Save the game and when it says don't turn off power, turn it off and on again. There will be 2 Mewtwos exactly the same, same moves, levels etc. Your friend now has 100 Mewtwos! Put the Gameboy game (Ruby, Sapphire, FireRed, LeafGreen or Emerald) in your DS and migrate. Transfer Mewtwo from the games via Pal Park (Route 221). Mewtwo will be wandering around in grass areas inside the Pal Park.

Answer 2

If you want Mewtwo in Pokémon Diamond, you have to trade or migrate it. Mewtwo can be found in the Cerulean Cave in FireRed/LeafGreen and HeartGold/SoulSilver and in the Unknown Dungeon in X/Y. You can either trade it with someone else, or from the DS games and you can migrate it from the GBA games in Pal Park. You can only migrate once every 24 hours and when you did, you can find it in the Field area.

Answer 3

You cannot get mewtwo in Pokemon diamond.