Pokemon SoulSilver Version

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National Dex

Beat the Elite Four once and go to the S.S Aqua ship in Olivine City to get the National dex.

Poke Points

You can use the points from the Pokeathalon in the shop to buy certain items. These change from day to day, so look for elemental stones and rare candies in the shop (and you can use the DS calendar options to change the day of the week).

Quick Radio Tower

At one point you are required to dress up as a Rocket to get to the radio tower. After you are told you have to get the key from the director, instead of taking the card key and battling the grunts, just head to floor B1 in the Goldenrod department store, head to the stairs, and you'll find the director. Battle the grunt and you're done.

Rematch with Legendary Pokemon

If you accidentally kill a legendary pokemon, don't panic. Just beat the Elite Four again and the legendary pokemon will be alive and roaming again.

Restart 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 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 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 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.

Trainer Card Color

Complete the following events for stars (in any order): Beat the Elite Four; Defeat Red; Win 100 consecutive battles in Battle Tower; Show Hibiki 5 Gold Leaf pokemon; Capture all 493 Pokemon (does not include event-only pokemon). The number stars you have determines your Trainer Card color.

Red Card - Default
Blue Card - Obtain 1 star
Bronze Card - Obtain 2 stars
Silver Card - Obtain 3 stars
Gold Card - Obtain 4 stars
Black Card - Obtain all 5 stars

Unlockable Pokewalker Routes

With regular usage of the Pokewalker included with SoulSilver, you can obtain Watts that can be used to unlock special courses that hold unobtainable pokemon in both HeartGold and SoulSilver versions. Watts are not total obtained, but collected in the game after returning from a stroll or sending gifts back to your game. There are also several routes unlocked by Nintendo Wifi Events and specific pokemon.

UnlockableHow to unlock
Amity MeadowUnreleased to all versions.
Beautiful BeachCollect 200 Watts.
Beyond the SeaTrade for an International Pokemon in the GTS in Goldenrod City.
Big ForestCollect 40,000 Watts + National Dex.
Blue LakeCollect 2,000 Watts.
Dim CaveCollect 1,000 Watts.
Hoenn FieldCollect 5,000 Watts + National Dex.
Icy Mountain RoadCollect 30,000 Watts + National Dex.
Night Skys EdgeObtain the PokeDex Data for Jirachi.
Quiet CaveCollect 100,000 Watts + National Dex.
RallyUnreleased to U.S. versions.
Rugged RoadCollect 50 Watts.
Scary CaveCollect 20,000 Watts + National Dex.
SightseeingUnreleased to U.S. versions.
Sinnoh FieldCollect 25,000 Watts + National Dex.
Stormy BeachCollect 65,000 Watts + National Dex.
Suburban AreaCollect 500 Watts.
The ResortCollect 80,000 Watts + National Dex.
Town OutskirtsCollect 3,000 Watts.
TreehouseCollect 15,000 Watts + National Dex.
Volcano PathCollect 10,000 Watts + National Dex.
Warm BeachCollect 7,500 Watts + National Dex.
White LakeCollect 50,000 Watts + National Dex.
Winner's PathNintendo Wifi Mystery Gift from 05/06/10 to 06/25/10
Yellow ForestNintendo Wifi Mystery Gift from 04/01/10 to 05/05/10