Can You Get All Three Legendary Pokemon, Mespirit, Uxie, And Azelf On Pokemon Platinum?

Err.I think it is Uxie,Azelf,and Mespirit in that order.First of all get uxie from the lake near snowpoint city which is lake acuity.Then get azelf in lake valor which is somewhere near Pastoria city and Veilstone city and mespirit is in lake verity which is somewhere near twinleaf town.And OF COURSE YOU CAN GET ALL OF THOSE POKEMON IN POKEMON PLATINUM!

Merspit : Lake near Twinleaf Town...You need Marking Map poketech app because it runs all around sinnoh
 
Uxie:   Lake near Snowpoint City (I may have go Uxie and Azelf mixed up)
 
Azelf : Lake in between Veilstone City and Pastoria City  

Yes you can get them all

Yes you can, at verity lakefront, valor lakefront and acuity lakefront. But only after you beat mt.coronet.

You can catch azelf and uxie but you have to chase mespirit all around sinnoh with a special poketech app

Yes you can get mespirit uxie and azelf in platinum it hard to get mespirit