rotom...go to the mansion before eterna city go upstairs go in to the room with the tv and battle rotom lvl15 heatron...go to stark mounton speak with the guy inside then go out and speak with him at his house in survival area then go back in th stark mountin and battle heatron lvl70 gurintina...after getting national pokedex go to rt 214 there will be a new path go though it then you will find a tample go through the maze and eventuallyyou will find gurintina lvl70
you can find legendary Pokemon by using your Pokemon tracker
yes it is a legendary can only be find i think in Pokemon diamond pearl and platinum
the legendary Pokemon in diamond and pearl are dialga and palkia.
Entei, Raikou and Suicine are often referred to as the Legendary Beasts or Legendary Dog pokemon. They aren't in Diamond, so you'll have to trade or migrate them. You can do this from the following games: FireRed/LeafGreen, HeartGold/SoulSilver and OmegaRuby/AlphaSapphire.
No, a Bidoof cannot evolve into any Legendary Pokémon in Diamond.
Heatran
you cant unfourtanately
a lot of legendary Pokemon
Dialga
arceus
you can't catch it because you already beaten the legendary
On the top of Mt. Coronet,you will find Palkia(Diamond you will find Dialga),BUT,There is another legendary Pokemon if you use action replay,That Pokemon is ARCUES