After getting the National Dex, go to Sandgem town and talk to Dawn/Lucus.
Behind Dialga when u beat him (only in Pokemon Dimand)
You can't.
Onux are rare ?
sure can
There is no Mewthree
yes
www.serebii.net
Get an action replay
Pokemon dimand/pearl
sunnyshore city
25 dollars
started mine with chimchar