Dialga all day long!!!! Diamond was my first ever pokemon game (go gen 4) and will always be one of my favourites. Dialga is just a monster of a beast, although arguably weaker than palkia, it has a much better defensive typing and who doesn't love roar of time? It just looks like a boss, I love the design so much more than palkia and he controls time, who doesn't love it haha! The thing that probably sold it most for me is the diamond part, diamon it the strongest and just the coolest, there is no doubt Dialga is the best!!