Catch Mewtwo, Raikou, Entei and Suicune in your Pokemon Platinum version

Mewtwo: Catch in Pokemon FireRed/ LeafGreen version and transfer through Pal Park.

Catching Mewtwo in your Pokemon FireRed/ LeafGreen version:

To catch Mewtwo in your Pokemon FireRed/ LeafGreen version, go to Cerulean City(after you' ve helped Celio repair his network machine), then proceed to the west. Surf across the river to the north and enter the cave located just across the way. To reach Mewtwo, follow the handy map.

Caution:

Not only is Mewtwo a massive handful(level70!), it' s also very, very powerful. Furthermore, the route to reach Mewtwo is stocked with very high level Pokemon, so make sure you' re heavily equipment with all manner of gear(think Elite 4 levels of equipment and then some) before plunging ahead. Also, it' s a good idea to have at least your starter be at party with Mewtwo level-wise(if not multiple Pokemon).

Raikou: Wild in Kanto(after beating Elite Four) if starter is Squirtle.

Entei: Wild in Kanto(after beating Elite Four) if starter is Bulbasour.

Suicune: Wild in Kanto(after beating Elite Four) if starter is Charmander.

next time:Catch Regirock, Regice and Registeel in your Pokemon Platinum Version.