I haven't seen the episode with Lucas in it. But in the game they do
Chat with our AI personalities
You can't. You won't battle Lucas as Dawn, or battle Dawn as Lucas.
they are dawn and lucas
Lucas because they have loved each other since they first met on their Pokemon adventure.
in diamond and pearl it's rare. you have to go to dawn's/lucas's house and talk to dawn's/lucas's sister. she will tell you which route and which Pokemon you can catch, one time i caught delibird!, (back to subject) finding this Pokemon is like not breathing for 29 days, but sometimes you're lucky and you find it at you're first try. it's best to use pokerader if ya have it. p.s you have to have the national pokedex before you can talk to dawn's/lucas's sister.
Yes Gary Oak love Pokemon Dawn