In heartgold/soulsilver you face the elite four 2x how can you do the first challenge again? (The lower level Pokemon)
You can't that's a one-time chance :/
No; once you've beaten the Elite 4, you will have to face them at their higher level. The only way to challenge the regular levelled Elite 4 is to play the game from the beginning again.
How to change your username How to add a user avatar Why was my post hidden? Question etiquette Flags vs Downvotes Anime FAQ Official PokemonDb League
Type a Pokemon name, type, move or ability to see instant results.