... The reason you hate Dialga more is... Because of a reason that affects life, not a game?
If we didn't have time, we wouldn't be able to move, if your logic works. We need to sleep for our body to rest, not because of time, but because of energy!
I go for Palkia, as it has Spacial Rend, which can obliterate others quite well with a High Critical Hit Ratio move called Spacial Rend, and doesn't need to charge like Roar Of Time.