Where do you see your rival again after you beat him at the Pokemon league on Pokemon heart gold?
he goes to train his Pokemon in the Dragon cave behind the gym in Blackthorn. Find him there and he will join you in a double battle against Gym leader Claire and Champion Lance. After this battle you will be able to register Claire's phone number if you have won.
The Pokemon League is basically the point of all the Pokemon adventure games. It has the Elite Four (and your rival) which are the most skilled trainers in the Pokemon world and if you beat them, you can call yourself the Pokemon Master. You must face the Elite Four (and your rival) all in a row without letting your Pokemon faint, if they do, you must start over again.
Where does your rival go after you battle with him in a double against lance and Clair in the dragons den in Pokemon heart gold?
You will fight your rival at - East of Jubilife City (after you give the parcel to your rival in the Pokemon School) Hearthome City (after you talk to your mother in the Pokemon Contest Hall) Pastoria City (after you beat the Gym Leader and talk to the Galactic Grunt) Canalave City (about two or three steps on bridge) Pokemon League (before you talk to the person blocking the entrance)
go to dragons den then surf to the back of the masters house you will see your rival he starts talking then Clair and Lance come you double battle against them with your rival. After that on Mondays and Wednesdays he challenges you at the second floor of the Pokemon League PS in the double battle all three (Lance Rival and Clair) use three Pokemon