What are the best Sinnoh region Pokemon to capture in Pokemon diamond?

Bibaral: can learn all HMs.

Dialga:Main Legendary.

Three Pixies(Azelf,Uxie,Mespirit): Have good Movesets.

*starter*Piplup/Prinplup/Empoleon: Can learn many Physical and Special Moves, can have many types of moves in party.

If you find more, add them here!

Giratina best Pokemon EVER

Palkia

Darkrai

Cressellia

Zapdos ARTICUNO MOLTRES 3 LEGENDARY BIRD POKEMON