darkrai and arcus
You get the pokegear from your mom after you talk to prof elm.
In Diamond, you can obtain a Water Stone in the underground in Sunyshore City.
The Pokegear radio is a pokegear option that allows you to play music. The music can bring out different Pokemon or give you advice. You can receive it in Goldenrod City.
Train a Magneton at Mt. Corenet
It's not exactly a phone, but you can obtain a PokeGear from your mother when you show your new starter Pokemon from Prof. Elm.
Pokephone? What Pokephone? Are you talking about the PokeGear? Sorry, Diamond doesn't have the PokeGear. It's in the new games Heart Gold and Soul Silver,though. Diamond's a bit too old, to be honest. The games are headed for international release in Spring 2010.
use the dowser machine on your pokegear it should tell you.
Trade.
there are 150 kinds of Pokemon that you can see and/or obtain. Unless you have friend trade you Pokemon that you can only get in pearl to you, you'll never obtain them all. In Pokemon diamond and pearl all you have to do is see the Pokemon and you get its data unlike the older versions where you have to obtain them.
Migrate it.
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darkrai and arcus
You get the pokegear from your mom after you talk to prof elm.
a REAL diamond? lol in a cave, if the Pokemon one, download it or buy it
The only way to obtain Articuno in Pokemon Diamond is to trade it from GBA via Pal Park.
No, you do not need diamond and pearl to obtain all the Pokemon in the national pokedex. You either need to have a friend who has all the older Pokemon, or you could transfer the Pokemon yourself from older games.