Note: This game is also titled Pocket Monsters HeartGold.National Pokedex
Defeat the Elite Four, then go to the S.S. Aqua ship in Olivine City to get the National Pokedex.! and ? Unown
Collect all other twenty six Unown (A through Z), and the ! and ? Unown will appear in the Hall Entrance.Pokewalker maps
Successfully complete the indicated task to unlock the corresponding Pokewalker map:
- Beautiful Beach: Get 200 Watts.
- Beyond the Sea: Trade for an International Pokemon in the GTS in Goldenrod City.
- Big Forest: Get 40,000 Watts and the National Dex.
- Blue Lake: Get 2,000 Watts.
- Dim Cave: Get 1,000 Watts.
- Hoenn Field: Get 5,000 Watts and the National Dex.
- Icy Mountain Rd.: Get 30,000 Watts and the National Dex.
- Night Sky's Edge: Trade a fateful-encounter Jirachi onto Pokemon HeartGold or SoulSilver.
- Quiet Cave: Get 100,000 Watts and the National Dex.
- Rally: Participated in the Wi-Fi Event during January 29th through February 28th, 2010 in Japan.
- Resort: Get 80,000 Watts and the National Dex.
- Rugged Road: Get 50 Watts.
- Scary Cave: Get 20,000 Watts and the National Dex.
- Sightseeing: Participated in the Wi-Fi Event during November 14th, 2009 through to January 11th, 2010 in Japan, and from April 17th to May 31st, 2010 in Korea.
- Sinnoh Field: Get 25,000 Watts and the National Dex.
- Stormy Beach: Get 65,000 Watts and the National Dex.
- Suburban Area: Get 500 Watts.
- The Resort: Get 80,000 Watts and the National Dex.
- Town Outskirts: Get 3,000 Watts.
- Tree House: Get 15,000 Watts and the National Dex.
- Volcano Path: Get 10,000 Watts and the National Dex.
- Warm Beach: Get 7,500 Watts and the National Dex.
- White Lake: Get 50,000 Watts and the National Dex.
- Winner's Path: Participated in the Wi-Fi Event from May 6th to June 25th, 2010.
- Yellow Forest: Participated in the Wi-Fi Event from April 1st to May 5th, 2010.
Successfully complete the indicated task to unlock the corresponding color. You can earn stars by completing the following tasks: defeating the Elite Four, finding all Shining Leaves, and capturing all 493 Pokemon (not including event-only Pokemon).
- Blue Card: Earn one star.
- Bronze Card: Earn two stars.
- Silver Card: Earn three stars.
- Gold Card: Earn four stars.
- Black Card: Earn five stars.
In the same rooms where you have to complete a picture puzzle of Kabuto, Aerodactyl, Ho-Oh, or Omanyte, there is a plaque that has a word that is spelled using Unowns. Complete the following steps to get the hidden items:
Room with the Kabuto Puzzle: The word is "Escape". You must use an Escape Rope while facing the plaque. You can easily get an Escape Rope at the Violet City Pokemart. The four items you receive are Energy Powder, Heal Powder, Oran Berry, and Pecha Berry.
Room with the Aerodactyl Puzzle (accessible by Surfing): The word is "Light". Use Flash while facing the plaque. The four items you receive are Energy Root, Heal Powder, Moon Stone, and Sitrus Berry.
Room with the Ho-Oh Puzzle: The word is "Ho-Oh". You must have Ho-Oh first in your roster. The items you receive are Charcoal, Leppa Berry, Life Orb, and Revival Herb. In Pokemon HeartGold, Ho-Oh is obtained in the Bell Tower. In Pokemon SoulSilver, Ho-Oh is obtained after you have defeated the Elite Four.
Room with the Omanyte Puzzle: The word is "Water". You must have a Water Stone in your bag. The items you receive are Leppa Berry, Mystic Water, Stardust, and Star Piece. You can get a Water Stone by winning it at the Pokeathlon on Wednesday.
Go to Violet City Pokemon Center. Tell the man next to the PC certain words when he asks you for your opinion. Use this website to generate these words. This will unlock special box wallpapers and Pokemon eggs in your game.In-game reset
While playing the game, press L + R + Start + Select.Game Boy references
Enter the Celadon Condominiums next to the Pokemon Center in Celadon City. Use the elevator to get to the third floor. When you exit, your friend will tell you about the GB Sounds. Talk to the man next to the globe after collecting all of the Kanto badges to get the GB Sounds Device.
Enable the "GB Sounds" option before entering the Union room, then trade with someone, and it will play the classic trade music.