Pokemon Heart Gold Version Cheats

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If you go inside the house near the Pokemon Center in Violet City, you can talk to a "School Kid". He will offer you an Onix holding a Persim Berry in exchange for a Bellsprout.
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If you go to the 4th floor of the Golden Rod Department Store, you will find a chubby guy who is looking for a Drowzee. He will give you a Machop holding a Macho Bracelet in exchange.
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When you go to Olivine City, search for two houses that are behind of the lighthouse. Go inside the left house. You will see a Fisherman who is looking for a Krabby. He will give you a Voltorb holding a Cheri Berry in exchange.
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If you go inside the house that is on the far eastern part of Blackthorn City, you will find a lady looking for a Female Dragonair. She will give you a Dodrio holding a Smoke Ball in exchange.
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If you go to the Pokemon Center in Pewter City, you will find a man who is looking for a Haunter. He will give you a Xatu holding a Wacan Berrry in exchange.
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One of the scientists in the Power Plant in Kanto is looking for a Dugtrio. He will give you a Magneton holding a Metal Coat in return.
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After getting Lt.Surge's phone number [Refer to other cheats], you can find him in the Magnet Train station in Saffron City. He is looking for none other than the Pikachu you showed him earlier. He will give you a Pikachu...a French Pikachu holding a Yellow Shard in exchange.
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After getting the Hoenn Starter from Steven Stone [Again, refer to other cheats] and speaking to him in the Pewter City Museum, you can see him standing in a different location in the Silph. Co in Saffron City. He is looking for a Forretress and is offering a Beldum holding a Dawn Stone in exchange.
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After you defeat Brock on Saturdays in the evening, you will find him in the entrance Diglett Cave. He will talk about Sudowoodo then Bonsly. He asks if you have one and he...