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
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Keep catching, there's more! Go to Professor Oak to get your Pokedex evaluated.
All I know is that there are 150 Pokemon at first and then you get the national pokedex and there are now 350 Pokemon. Hope this helped!
Professor Oak gives you a diploma...that's pretty much it.
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.
Blast Burn is much like a Fire-Type Hyper Beam. It has a power of 150 and your Pokemon will require a rest afterwards.