After you have collected all other twenty six Unown (A through Z), the ! and ? Unown will appear in the Hall Entrance.
When you get to the top of Mt. Silver, there is a trainer called "Red". He is actually Ash from the Pokemon television series.
When you start a new game and you will be warned that you cannot save until you delete previous data. Accept the warning, then play until you can move your character. Enter the "Options" menu and select "Save". You will be told to press Up + Select + B at the main menu. This will delete the old profile and begin your new one.
In Ecruteak City at the Dance studio, a Team Rocket grunt is hassling a kimono girl. Talk to the person on the right side of the stage. He tells you he would have put a stop the grunt's behavior if it was not for the incredible pain of his stomachache. This is a tactic commonly used by Hercule Satan in Dragon Ball Z to get out of fighting.
Once you obtain all 16 badges, talk to the music designer in Celadon, and you unlock the 8-bit originals from the original gold/silver games.
Feeding Oran Berries to the Miltank
You can get about one to three Oran Berries before you have to do this task. However you probably have used them or at least only have one Oran remaining. If you do not have any Oran Berries, at the sixth floor of the Goldenrod Department Store is a betting corner, where you pay 300 to draw a ticket. The ticket will win you a #1, #2, or #3 prize. The #1 prize is the TM of the day (the woman next to the ticket counter will tell you what it and the #2 prize is). The #2 prize is a special Pokeball. The #3 prize is a random selection of one of ten different berries, including the Oran. Do not waste your money by trying to get a large number of them. The Miltank needs seven Oran Berries. Harvest the berries in the berry pots until you have seven of them. Optionally, the girl to the left of the Miltank will give you a seal case and the girl on its right will give you three seals. The farmer woman gives you a TM Natural Gift. Once you give the Miltank the berries you can buy Moomoo Milk (which heals 100 health) for 500. Finally in Olivine, the girl in the house north of the Pokemart will give seals.
Full moon in broad daylight
Witness the Clefairy dance on Mt. Moon on Monday night between 8:00 p.m. and 12:00 a.m. Wait for morning without leaving the area. When daylight comes, the full moon will still be reflected in the pond. This can be done easily by witnessing the event, saving the game, closing the DS, and waiting until morning.
At Celadon City, enter the Celadon Condominiums next to the Pokemon Center. Use the elevator to reach 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.
Press L + R + Start + Select during game play.
Level Up Unhatched Pokemon
To do this glitch, you must first execute the Pomeg Berry Glitch, which is done by using a Pomeg Berry on a Pokemon with 1 or 2 HP so that its HP loops to 65,535 (displayed as ?35 in-game). Do so, however, with only one Pokemon and an Egg in the party, with the Egg in the top-leftmost slot of the party in the Pokemon menu. After executing the glitch, you will now be able to enter battles and use the Pokemon Egg as if it were a normal Pokemon. It will function as a normal Pokemon - you can view the stats it will have upon hatching, it can level-up by beating Pokemon, it can learn new moves, it can even evolve. This means that you can alter the Pokemon inside the Egg in otherwise-illegitimate ways. For example. Pikachu cannot normally know Thunder when hatching from an Egg at Level 5; through this glitch, Pikachu can. Similarly, you can hatch Eggs with fully-evolved Pokemon such as Typhlosion, Meganium, and so on, inside.
Beat the Elite Four once and go to the S.S Aqua ship in Olivine City to get the National Dex.
Complete the indicated task to unlock the corresponding map.
Beautiful Beach: Get 200 Watts.
Beyond the Sea: Get a foreign Pokemon by using the GTS.
Big Forest: Get 40,000 Watts and own the National Dex.
Blue Lake: Get 2,000 Watts.
Dim Cave: Get 1,000 Watts.
Hoenn Field: Get 5,000 Watts and own the National Dex.
Icy Mountain Rd.: Get 30,000 Watts and own the National Dex.
Night Sky's Edge: Trade a fateful-encounter Jirachi onto Pokemon HeartGold or SoulSilver.
Noisy Forest: Available by default.
Quiet Cave: Get 100,000 Watts and own the National Dex.
Rally: Participated in the Wi-Fi Event during January 29th through February 28th, 2010 in Japan.
Refreshing Field: Available by default.
Resort: Get 80,000 Watts and own the National Dex.
Rugged Road: Get 50 Watts.
Scary Cave: Get 20,000 Watts and own 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 own the National Dex.
Stormy Beach: Get 65,000 Watts and own the National Dex.
Suburban Area: Get 500 Watts.
Town Outskirts: Get 3,000 Watts.
Tree House: Get 15,000 Watts and own the National Dex.
Volcano Path: Get 10,000 Watts and own the National Dex.
Warm Beach: Get 7,500 Watts and own the National Dex.
White Lake: Get 50,000 Watts and own the National Dex.
Winner's Path: Participated in the Wi-Fi Event from May 6th to June 25th, 2010.
Yellow Forest: Participlated in the Wi-Fi Event from April 1st to May 5th, 2010.
For this glitch to work properly, you must have a Pomeg Berry and a Pokemon who has not had their HP lowered as much as possible already through Pomeg Berries. (If the latter is the case, the use of HP Ups on the Pokemon will suffice.) Get the Pokemon to a severely low level of HP (1 or 2 HP). Once you do so, in the field, use the Pomeg Berry on the Pokemon. This will in turn cause the data in their HP to cycle back to the top of the counter, giving the affected Pokemon 65,535 HP - over 90 times the otherwise possible maximum in the game.
Simultaneously press L + R + START + SELECT to reset the game.
Ruins of Alph: Hidden items
In the same rooms where you have to complete a picture puzzle of Omanyte, Kabuto, Aerodactyl, or Ho-Oh, there is a plaque that has a word that is spelled using Unowns. Do the following steps.
Room with the Kabuto Puzzle: The word is "Escape". You must use an Escape Rope facing the plaque. You can easily get an Escape Rope at the Violet City Pokemart. The four items obtained 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 obtained 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 obtained 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 obtained are: Leppa Berry, Mystic Water, Stardust, and Star Piece. A Water Stone can be obtained by winning it at the Pokeathlon on Wednesday.
Secret box wallpapers and Pokemon eggs
Go to the Violet City Pokemon Center. Notice the man next to the PC. Tell him certain words when he asks you for your opinion. Use this site to generate these words. This will unlock special box wallpapers and Pokemon eggs in your game.
When you go to the back of the Safari Zone where the poles are, they will split in two or fuse together depending on where you are standing.
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).
Complete the following tasks to add a star to your Trainer card. Note: Shiny Leaves are obtained by speaking with your Pokemon in certain areas on rare Nature-dependent locations.
Defeat the Elite Four and Champion.
Give Ethan or Lyra five Shiny Leaves.
Break records in ten Pokeathlon events.
Win 100 battles in a row at the Battle Tower.
Complete the National Pokedex (except for Mew, Celebi, Jirachi, Deoxys, Phione, Manaphy, Darkrai, Shaymin, and Arceus).
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