How to catch all the legendary Pokemon in heartgold without action replay?
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These are the only Legendary Pokemon you can find in 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.
Lugia - Can be found deep inside Whirl Islands. You need the Silver Wing in order for Lugia to appear.
Raikou - Can be found roaming the Johto Region after your first encounter with it.
Entei - Can be found roaming the Johto Region after your first encounter with it.
Suicune - After chasing Suicune around the Johto and Kanto Region, it will finally stay put on Route 25.
Moltres - Can be found deep inside Silver Cave, after you have obtained all sixteen badges.
Zapdos - Can be found outside the Power Plant, after you have obtained all sixteen badges.
Articuno - Can be found deep inside Seafoam Islands, after you have obtained all sixteen badges.
Mewtwo - Can be found deep inside Cerulean Cave, after you have obtained all sixteen badges.
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.
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.
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.
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.
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.
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.
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.
I would suggest to use Ultra Balls to catch these Pokemon.
The other Legendary Pokemon can be obtained by Trade, Migration (Pal Park), or an Action Replay Code.
Hope this helps!
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