That's not ash its trainer red although he's based off from Pokemon yellow.
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You can't fight ash...only red
Kinda, Ash in the anime was based off of Red from the original Pokemon games Red and Blue. That's why all his Pokemon are similar.
There is no best Pokemon on Pokemon HeartGold.
there is no Pokemon Mansion in Heartgold.
Sacred ash is an item held by Ho-oh that revives all of the Pokemon in your party that are fainted and their Hp is completely restored. It is very useful if you save it until the Pokemon league. WARNING: only works once. Once you use it it disappears.