Sacred ash is a concept from the Pokémon anime, where it's used by trainers to honor the spirits of Pokémon. It doesn't exist as an item or mechanic in the games.
In HeartGold and SoulSilver, there are various ways to pay tribute to your Pokémon, such as:
* Training them: Building strong bonds with your Pokémon through training and battles shows you care for them.
* Giving them berries: This is a way to show you care for their health and well-being.
* Healing them: Using Potions, Revives, and other healing items demonstrates your concern for their safety.
* Visiting the Pokémon Cemetery: This peaceful location allows you to remember your fallen companions.
While sacred ash is not a feature in the games, you can still show your affection for your Pokémon through gameplay and create a strong bond with them.