What legendaries can you catch in Platinum?

Question

Without AR.

Answer 1

Without events or trading, you can get:

Giratina
Uxie
Azelf
Mesprit
Palkia
Dialga
Heatran
Cressalia
Articuno
Zapdos
Moltres

These guys you get by trading or through events:
Regigigas
Regirock
Regice
Registeel
Darkrai
Arceus
Shaymin

Answer 2

Without events the lake trio(azelf, mesprite, uxie), the dragon trio(dialga, palkia, griatina), cresselia, heatran, the bird trio(articuno, zapados, moltres) with events jirachi, shaymin, regigigas, regirock, regice, and registeel, arceus, darkrai, and soon mew

Comments

Soon mew?  When's the event?

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Serebii said that one is coming up

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Incredibly unlikely, seeing as you can just get it from My Pokemon Ranch.

Answer 3

Giratina
Uxie
azelf
mesperit
DIalga
palkia
heatran
regigigas
cresselia
zapdoas
articuno
moltres
regirock
regice
registeel
dakrai (event over)
shaymin (event over)
Areceus (event over)

http://www.serebii.net/platinum/legends.shtml

Also to catch regirock/ice/steel, you need an event regigigas.