"HeartGold" is one of dozens of "Pokemon" games. The player spends his time catching, training and fighting Pokemon. He can get the most powerful Pokemon only by raising them from their weaker antecedents, as is the case with the mechanized dinosaur Aggron. The player cannot catch Aggron in the wild, but must instead raise them an earlier Pokemon form, Lairon. The evolution is straightforward and doesn't require special items or happiness. So long as the Lairon reaches level 42, it will spontaneously evolve into an Aggron.
Instructions
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1
Put Lairon in the front slot of your party. Here, he'll be the active Pokemon during a battle. He'll also receive the most experience this way.
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2
Wander around in dungeons and routes. You'll randomly encounter wild Pokemon, and by defeating them, your own Pokemon gain experience. With enough experience, they then gain levels.
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3
Continue fighting with Lairon in the lead. When he reaches level 42, he'll become an Aggron.
