u need to beat Candice at snowpoint city and talk to Jupiter at lake acuity.
go to the guy in Canalave City the house by the pokemart (diamond and pearl)
in diamond and pearl you find him in Eternacity
The name of the "yellow haired" guy is Barry if you are talking about Pokemon diamond and pearl series.
i know that in Pokemon diamond pearl and platinum the daycare man is in solacean town
No, you have to get them from Pearl.
You find a old amber underground (really rare) and get the guy at the mining museum to turn it into a pokemon.
Same as Pokemon Diamnd/Pearl. And heres a guy doing it on Pokemon diamond: http://www.youtube.com/watch?v=9xMVXUn5whI
no man gives you a happiny platinum only in diamond and Pearl
you can get a riolu egg in Pokemon diamond/pearl on Iron Island by helping a guy named Riley out
OK I'm going to improve the answer to this question because the guy before me wants to be an a#$ about it. I don't think you can catch Pokemon from Johto in Pokemon Diamond or Pearl, but I do know they are coming out with a remake of Pokemon Silver, Gold, and Crystal. It is for the DS so you will have to trade between someone with a Silver, Gold, or Crystal version to your Diamond and Pearl game.
You must go to the cave where you capture either dialga or palkia, get them(optional), and then the guy will let you through.
go to the city with the 6th gym leader there is a guy somewhere that will delete the moves