Oh, I meant for the special event to get a level 1 Giratina, Dialga, or Palkia.
Make sure Arceus is the only Pokemon in your party, then go to the Ruins of Alph, then try to go in that little house that's there. Watch cutscene, talk to Cynthia, watch more cutscenes, bam.
Venamoth is ugly. Venonat was much cuter, but much weaker. ;-;