No, infact the game has a pervention method to pervent a Shiny Notched Ear Pichu from being shiny.
To get hippopotas in heartgold and soulsilver you need to go to safari zone and use special items.
You can get it in Pokemon Black and White if you send a special Celebi from Pokemon Heartgold, Soulsilver, Pokemon Platinum, etc.
They don't actually have an official website. But the official Pokemon website to find information (in Japanese) is this: www.pokemon.co.jp/special/hgss
i think heartgold is hell better because hoho has a amazingly pro high attack and special attack and lugia has a high defense and to much of attack.(remember you can't only be able to take a hit you must also be able throw a hit back).
It depends what you mean. If your talking about a video game, you can only use them outside of battle if they have special moves. Say you have a tree in your way, you could use a Grovyle that knows the move Cut to chop the tree out of your way. Unless you have Heartgold or Soulsilver, you cannot do much. In Heartgold and Soulsilver you may choose the Pokemon you like and have it walk with you.
You cannot find a wild Deoxys in in Pokemon Soul Silver, or HeartGold. Deoxys can only be obtained by trading with someone or by getting one at special distributions.
you can't catch him, you have to wait for a special event.
You can trade it from Diamond, Pearl, Platinum, HeartGold and SoulSilver.
special events
i f you dont have dimond perl or platnom you need to get the special arcaus via mystory gift or trade. this will make an event happen in witch you can get him.
Nope has to be the special event Celebi in HeartGold and SoulSilver
Extremely difficult actually!! Because Darkrai can only be obtained in Pokemon Ranger: Shadows of Almia by completing a special mission, then transfered to Pkemon Heartgold or Soulsilver... : ^ (