Important things to do:
* Get your 5th badge: This is essential to progress the story.
* Explore the Kanto Region: You can now travel to Kanto, the region from the original Pokemon games, through the newly opened portal in the Sevii Islands.
* Visit the Kanto Gyms: You can challenge the 8 Kanto gym leaders for a new set of badges. This is optional but highly recommended.
* Catch new Pokemon: You can find new Pokemon in both the Kanto and Johto regions, including some of your favorites from the original games.
* Continue the Story: The story progresses to the Elite Four, who are located in Indigo Plateau in Kanto.
Optional activities:
* Train your Pokemon: The Elite Four are extremely strong, so you'll want to level up your team and teach them new moves.
* Train at the Battle Tower: This is a great place to test your skills against other trainers and gain experience.
* Complete the Pokedex: There are plenty of Pokemon to be found in both regions.
* Find rare items: There are many valuable items hidden throughout the regions, including powerful TMs and evolution stones.
* Participate in events: If you play on a Virtual Console, you can sometimes participate in special events that offer unique rewards.
Remember:
* The Elite Four are very powerful: You'll need a strong team to defeat them.
* Don't forget the Kanto region: It's full of interesting locations and Pokemon to discover.
* Have fun! Pokemon HeartGold is a fantastic game with a lot to offer.
Enjoy your journey to becoming a Pokemon Master!