Pokemon Crystal also introduced a feature into the Pokémon series which wouldn't exist again until five years later with the advent of Pokémon Diamond and Pearl. At the same time Pokémon Crystal was released in Japan, a new peripheral was released called the Mobile Adapter GB. This Japan Only peripheral allowed you to connect your GameBoy Color up to your mobile phone, and use the mobile phone in order to make connections around the world.

Once you connect the Mobile Adapter to Pokémon Crystal, two new options will appear on the home screen, Mobile and Mobile Stadium. Mobile, which allows you to connect to it, unlocking the PCC and Battle Tower. Mobile also contains features such as the Name Card Folder which allows for you to track your friends, your own Profile and various other features. Mobile Stadium allowed for the connection with Pokémon Stadium 2 in order to view battles you have had in full 3D.

The service has since ended, on December 18th 2002, so these features can no longer be used.

Pokémon Communication Centre

Location: Goldenrod City

Method:
The Pokémon Communication Centre starts off as seeming like an ordinary Pokémon Centre, but as you activate the Mobile Adapter, the centre opens up. In it, you will find a special Trade Corner, which allows you to trade with various people wirelessly across Japan. It also included the Pokémon News Network, which gave various updates about the game, as well as details on special downloads

Battle Tower

Location: Route 42

Method:
Located above Route 42 is the first iteraton of the Battle Tower. In the Japanese version, this unlocked with the use of the mobile Adapter and allowed for battle with people across Japan. It also tracked various people, the amount you battled and other such statistics

Restrictions
10 floors: Level 10, 20, 30, 40, 50, 60, 70, 80, 90, 100
Pokémon: Cannot use Mewtwo, Mew, Lugia, Ho-Oh, Celebi
Cannot use two of the same Pokémon or hold item.

Within the English release, this kept the restrictions and levels, but included more AI trainers having you face up against 7 per floor. These trainers used Pokémon from a random selection and you were given Protein, Calcium, Carbos, Iron and Zinc whenever you defeated all seven trainers on the floor.

Events

GS Ball

Duration: March 29th 2001 - May 29th 2001 & August 1st 2001 - August 28th 2001

Method:
To acquire a GS Ball you have to connect the game to the mobile phone with the Pokemon Mobile Phone System GB. This cannot be done in the US. You must have all 16 badges, beat a minigame, and complete a quiz to have the attendent at the Pokemon Communication Center in Goldenrod City give you a GS Ball. Once you have it, take it to Kurt to have him inspect it. After 24 hours he'll tell you about a strange presence in the ball before dashing outside. Follow him and he'll say Ilex Forest is uneasy and that you should check it out with the GS Ball.
The trees will be rustling in the forest. Take the GS Ball to the shrine. When asked if you want to put the GS Ball in the shrine, say yes and Celebi will arrive to challenge you. Celebi holds no special items. Grass/Psychic is weak to Fire-, Flying-, Ghost-, Dark-, Ice-, and Poison-types and has a double weakness to Bug-types but offers good STAB and learns powerful moves like Giga Drain, Psychic, and Solarbeam. Because you need all 16 badges to fight it but is faced at a low level of 30, it would be wise to bring something that can inflict status before it uses Safeguard but not OHKO it. Be prepared for a long fight as it can heal with Recover.

Celebi
Level 30
OT:Yours
ID:Yours
Hold Item:
None
Recover
Safeguard
Ancientpower
Future Sight
Odd Egg - Pichu, Cleffa, Igglybuff, Tyrogue, Smoochum, Elekid, Magby

Duration: January 27th 2001 - December 14th 2002

Method:
In addition to the Togepi egg from Gold and Silver, players can obtain a second egg in the Crystal version. This egg can hatch into any of the baby Pokemon, allowing players to potentially receive their favourite Pokemon far earlier in the game than normal, with the special move Dizzy Punch as an added bonus. This page details how to get it in both the Japanese and International versions.

Japanese Version
In the Japanese version, players get an Egg Ticket from the Day Care Man which must be redeemed at the Pokemon Communication Center in Goldenrod City. Any of the baby Pokemon have a 50% rate of being shiny.

Pichu
Level 5
OT:Yours
ID:Yours
Hold Item:
None
Thundershock
Charm
Dizzy Punch
Cleffa
Level 5
OT:Yours
ID:Yours
Hold Item:
None
Pound
Charm
Encore
Dizzy Punch
Igglybuff
Level 5
OT:Yours
ID:Yours
Hold Item:
None
Sing
Charm
Defense Curl
Dizzy Punch
Tyrogue
Level 5
OT:Yours
ID:Yours
Hold Item:
None
Tackle
Dizzy Punch
Smoochum
Level 5
OT:Yours
ID:Yours
Hold Item:
None
Pound
Lick
Dizzy Punch
Elekid
Level 5
OT:Yours
ID:Yours
Hold Item:
None
Quick Attack
Leer
Dizzy Punch
Magby
Level 5
OT:Yours
ID:Yours
Hold Item:
None
Ember
Dizzy Punch
Mirage Mail

Duration: 2001

Method:
This distribution ran for a time in 2001 and allowed for you to receive the special Mirage Mail, which is unavailable in the games otherwise

 
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