What legendary Pokemon can you get in platinum?

Answer 1

These are the Legendary Pokemon you can find/migrate in platinum After you enter in the hall of fame. you can however get some before entering the hall of fame, and some need special events or an action replay/GameShark to catch.

after visiting pal park then wil prof oak go to his house and he wil say where zapdos , moltres and articuno is ( but i don't know where his house is,, forgotten )

Pokemon you need to migrate:

Regirock/Regice/Registeel - Rayquaza - Kyogre - Groudon - Latias - Latios

Pokemon you can get before entering the hall of fame:

Uxie - Azelf - Mesprit - Giritina

Pokemon you can get after you enter the hall of fame:

Dialga - Palkia - Cresellia - Heatran - Giritina - Regigigas

Pokemon you need to go to a special event or use an action replay/gameshark for:

Deoxys - Celebi - Lugia - Ho oh - Shaymin - Darkrai - Manaphy - phione - Jarachi -

P.S. You can only get 1 giratina in the game. It doesn't matter wheather you get it before or after entering the hall of fame.

P.S.S. Im not sure about Dialga and Palkia, best go for them after entering the hall of fame though, just in case.

P.S.S.S. To get Phione you need a Manaphy and breed it with a Ditto.

P.S.S.S.S. To get Regigigas you need the other Regies in your party. it can be found on the bottom floor of the temple just north of snowpoint city.

Answer 2

All from almost all gba games. Pokemon you can catch in platinum is: Giratina, Mesprit, Uxie, Azelf, Cresselia, Heatran, and Shaymin, Darkrai and Arceus are event. Rotom is like half-legendary.