Sorry, no. Only kanto and johto.
you cant get to sinnoh in heart gold, but you can find the gym leaders from sinnoh.
No
Yes,you can but you only get rare Pokemon from sinnoh and hoenn.
Sinnoh wasn't included in HG/SS, only Johto and Kanto.
you get him by trading through any sinnoh game
he goes to sinnoh
in every game except gold and silver and crystal there are 8 badges, gold silver and crystal have 16 cause you can fight the kanto and johto leaders.
I assume you have either Heart Gold or Soul Silver. These are the only Pokémon games that have the ability for your player to get 16 badges. Every other game has 8 badges. If you mean specifically how do you obtain badges, beat the gym leaders in the different towns. If you want a complete walkthrough of how to get every badge, just search "[game] walkthrough".
you have to get all eight gym badges
i think so because my heart gold connected with platinum he has his 16 badges but when pplatinum looked at heart gold case it showed 8 sinnow badge slots!!
no u can't
go to pallet town after you have 16 badges and go to professor oak's lab