you can get an effort ribbon from a lady in the sunnyshore city market. you can also get a ribbon from the footprint guy, beating the elite four, a guy in sunnyshore, but need rock climb to get to his house, and a lady named Julia in sunnyshore will give you a ribbon every day for six days.
You trade for it like anyone else
in contests (diamond) or tents (ruby)
You can't find Registeel in Pokemon Platnium. You just migrate it in Pokemon Ruby, Pokemon Sapphire, and Pokemon Emerald.
There is no 'platnium', but you can find it on wild pokemon.
you cant catch it in platnium but you can trade it
the most wanted in this houshold is Pokemon platnium
It is Pokemon platnium.
Barboach
by-Pokeexpert980 The same as PEARL/DIAMOND/PLATNIUM 493
spell you trash 'platnium'=Platinum
from Pokemon FireRed
you can get it in pokemon platinum!