Legendary Pokemon of Pokemon HeartGold
Ho-Oh - Can be found at the top of Bell Tower. You need the Clear Bell and Rainbow Wing in order for Ho-Oh to appear. It will be at Level 45.
Lugia - Can be found deep inside Whirl Islands. You need the Silver Wing in order for Lugia to appear. It will be at Level 70.
Raikou - Can be found roaming the Johto Region after your first encounter with it. It will be at Level 40.
Entei - Can be found roaming the Johto Region after your first encounter with it. It will be at Level 40.
Suicune - After chasing Suicune around the Johto and Kanto Region, it will finally stay put on Route 25. It will be at Level 40.
Moltres - Can be found deep inside Silver Cave, after you have obtained all sixteen badges. It will be at Level 50.
Zapdos - Can be found outside the Power Plant, after you have obtained all sixteen badges. It will be at Level 50.
Articuno - Can be found deep inside Seafoam Islands, after you have obtained all sixteen badges. It will be at Level 50.
Mewtwo - Can be found deep inside Cerulean Cave, after you have obtained all sixteen badges. It will be at Level 70.
Latios - If you received the Enigma Stone from the Event, then Latios can be found in Pewter City after you have shown the Enigma Stone to the Pewter City Museum Attendant. It will be at Level 40.
Latias - Once you have obtained the National Pokedex and have visited the Pokemon Fan Club in Vermillion, Latias can be found roaming the Kanto Region. It will be at Level 35.
Dialga - If you have the event Arceus from the 12th Movie or an Arceus that was obtained in the Hall of Origins, you can choose to find Dialga in the Sinjoh Ruins. It will be at Level 1.
Palkia - If you have the event Arceus from the 12th Movie or an Arceus that was obtained in the Hall of Origins, you can choose to find Palkia in the Sinjoh Ruins. It will be at Level 1.
Giratina - If you have the event Arceus from the 12th Movie or an Arceus that was obtained in the Hall of Origins, you can choose to find Giratina in the Sinjoh Ruins. It will be at Level 1.
Kyogre - Once you have received the Kanto Starter Pokemon from Professor Oak and have obtained the Blue Orb from Mr. Pokemon, you can find Kyogre in the Embedded Tower. It will be at Level 50.
Rayquaza - If you show Professor Oak a Kyogre and Groundon that where obtained in the Embedded Tower, you will receive the Jade Orb. You can now find Rayquaza in the Embedded Tower. It will be at Level 50.
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