i mean when does chansey evolve into blissey? and how do i get a hold of a moon stone in the diamond and pearl game?

i have the burmy but when i trained it to become lv 20 it evolve to Mothim.....please i really need help on completing my pokedex? thnx in advance..

ok so I have a diamond and im working on completeing my pokedex and im looking to catch a shieldon but i cant find him anywhere in diamond also what lvl does goldbat evolve and finally I got a burmy but when it evolved it dint evolve into a ...

Should I train Wormadam(plant cloak) or Mothim? My team is : Spiritomb, Difloon, Psyduck Also when does Psyduck evolve? thanks