get an action replay, get Pokemon modifier and full pokedex cheats, then find arceas!
ADAE-636791C0 is the AR ID for Pokemon Diamond
you have to get a code.
go to www.codejunkies.com and www.supercheats.com to find out AR Pokemon Diamond/Pearl codes for the DS
there is non
you need ar
use ar
action replay
its impossible without ar
you can't unless you have AR
no way
ar or through an event
inposple