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I don't organize my Pokemon.
In Platinum my boxes are overflowing and I have to release some of my Pokemon.
What I'm thinking to do is transfer my event Pokemon collection (which consists of over 70 Pokemon) in my HG/SS.
Also, I have lots of EV'ed and IV bred Pokemon.
In FireRed, I am leveling up my team and soft reseting for a Porygon with good IVs.
I have already caught all of the legends and transferred them to my Platinum game.
Pokemon Platinum is an improved version of D/P. It introduces new Pokemon forms (Rotom, Giratina, Shaymin), the Battle Frontier and new move tutors.
However, I don't think you should buy Platinum
You'd better save your money for another game.