1. Return to Ecruteak City: You'll be transported back to Ecruteak City after the battle.
2. Talk to the Elder: The Elder will congratulate you on your victory and reveal that the legendary Pokemon, Raikou, Entei, and Suicune, are roaming Kanto.
3. Chase the Legendary Pokemon: Now, you can start your journey to capture the legendary beasts, Raikou, Entei, and Suicune. These Pokemon are roaming around Kanto, and you'll need to track them down. You can use the Radio Tower in Goldenrod City to get hints about their locations.
4. Explore Kanto: After catching the legendary beasts, you can explore Kanto and complete the rest of the game. You'll encounter trainers, Gym Leaders, and even the Elite Four again.
5. Finish the game: Finally, you can complete the game by defeating the Elite Four and becoming the champion of Kanto!
Here are some additional things you can do after the tag battle:
* Train your team: Make sure your Pokemon are strong enough to face the challenges ahead. You can train them at the various training areas in Kanto.
* Collect badges: You can collect all eight Kanto badges, which will allow you to enter the Indigo Plateau and challenge the Elite Four.
* Complete the Pokedex: You can continue to catch new Pokemon and complete your Pokedex.
* Find all the legendary Pokemon: There are other legendary Pokemon in Kanto, such as Mewtwo, Articuno, Zapdos, and Moltres. You can try to find and capture them.
The tag battle against Lance and Clair is a major turning point in the game, but it's just the beginning of your adventure! Enjoy exploring Kanto and completing all the challenges it has to offer.