Keep catching, there's more!
Go to Professor Oak to get your Pokedex evaluated.
Chat with our AI personalities
An original Pokemon gold version that is in minted condition (meaning you haven't opened the box and it is undamaged) is worth 150 American dollars, however, a used version is barly worth 15 Dollars. Dont bother selling it.
You have basically completed the game. You can also get the 151st Pokemon (Mew) but you can only do it through an in game glitch (search it on YouTube) or by using a cheat device. You can also go to Celadon City and go to the Large Building and talk to the Game Designers the game creater will give you a diploma whether you have caught 150 or 151 Pokemon.
Well when you SEE all 150 Pokemon prof. Oak will give you a deploma then go to cinnibar island and head inside and talk to bill...and be ready for an adventure!! Then when you own all 150 Pokemon you can get the mystic ticket! (which you can only get in an event) this allows you to get ho-oh and lugia! yipee
Here is a list of all 150 Pokemon: http://www.serebii.net/diamondpearl/shinoudex.shtml The last Pokemon listed (#151) is not required to get the national pokedex.
go onto Pokemon .com