Question: what are the best pokemon in pokemon platinum?
Answer: Gardevoir. I have utilised this lovely sorceress many times throughout my playthrough. ... 
Togekiss. Relatively easy to get. ... 
Garchomp. Super fast, super high stats, and just pure brilliance. ... 
Lucario. Maylene (in Diamond and Pearl) or Riley (in Platinum) gives you a Riolu egg so don't worry about finding one. ... 
Luxray.