I think you have to beat the eliete Four i know mespirt you catch in the wild use your mark map chart thing
The legendary is palkia
there are caverns in the middle of the three lakes the three spirits appear there after you beat the Pokemon league.
in Pokemon Diamond/Pearl Azelf/Mespirit/Uxie are all found in 1 of the 3 lakes. 3 lakes, 1 of those legendary Pokemon can be obtained there.
After you've caught the main legendary( either dialge or palkia) there will be the three legendaries in the lakes- azelf, mesprit and uxie. :-)
there is four legendary Pokemon you could catch first you need seven bagdes go to the top of mt. coronet and beat Cyrus you will see the Pokemon palkia is a legendary Pokemon after that go to the lakes and you could catch azelf mesprit and uxie which are legendary Pokemon note-i did not use uppercase letters
It's not a legendary in Pokémon Pearl.
on Pokemon pearl you only see 1
the legendary Pokemon in diamond and pearl are dialga and palkia.
No, but there is a Rotom in the TV.
There are no 'Grand Lakes' in Pokemon Diamond and Pearl, but there are the three lakes that have Uxie, Mespirit and Azelf.
Palkia
The dragon pokemon palkia.