www.serebii.net to find any Pokemon info=)
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You can find the chapter on youtube
you can find rock types in caves or in victory road.
The Pokemon website and Marriland.com
you can find information on Pokemon heart gold and soul silver on this website www.bowserrules.piczo.com
Do the mission-go onto the Pokemon ranger website
Go to www.Google.com and type in Pokemon pearl websites
Use the Pokemon locater to find it.
www.serebii.net has a list of every Pokemon and shows where and how to find them.
Bulbapedia, the Pokemon Wiki, and Serebii are good sources.
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
You can find them by surfing and fishing.