There is a socialite who only has a Roselia.
There is no trainer with riolu as far as I know. But if you go to Iron Island and team up with Riley, he will give you an egg that will hatch into a riolu. You must finish the journey with him before though. he will give it to you when you defeat team galactic. Remember - you can't get it if you have six Pokemon in your team
pal park
go to iron island. riley gives it to you at the entrance
You get to the trainer card and press it. And then you can make your own phrase, NOOB!
in Platinum on your way to the spear tower the detective gives it to you in Mt Coronet. it is most likely the same in pearl.
No you cannot because you get get it in the wild and no one gives i to you you can migrate from another game like pokemon Heartgold where you get it after you beat trainer Red ontop of mt. Silver.
Cynthia gives it to you.
jortan
Cynthia's grandmother gives it to you.
someone gives it to you.
you can not get a master ball in Pokemon platinum only the one professor Rowan gives you
cyrus gives it to you
The Champion probably
Im sorry, but there is no happiny egg in Pokemon platinum. You got diamond or pearl? trade from there
There is no trainer with riolu as far as I know. But if you go to Iron Island and team up with Riley, he will give you an egg that will hatch into a riolu. You must finish the journey with him before though. he will give it to you when you defeat team galactic. Remember - you can't get it if you have six Pokemon in your team
They altered and changed a bit here and there in Platinum, and the hiker no longer gives you Happiny in Hearthome City.
A fisherman at the fight area gives it to you.