Giratina emerged from its egg at Level 40 in its Origin Forme, its platinum armor glowing in stark contrast to its shadowy body... A strange energy surrounds Giratina... It distorts the air around it... Giratina can immediately be transformed into its Altered Form upon hatching at Level 40! Seems you might have to level it up another time to change it back! EDIT: Hmmmmm... no form change option upon hitting Level 41. Gonna try getting to Level 42 and see what happens... EDIT: Wuh oh, didn't get an option to change at Level 42 either. Maybe it's multiples of 5? RIP my planned postings if it is X_X EDIT: So, after a bit of talking in the Discord, it appears Giratina cannot change between forms; all form changes are permanent. If you'd like to keep your flying danger noodle a flying danger noodle, avoid clicking that green arrow!!!
Ackkk, now I'm hyped to hatch a Giratina egg. The last one was a dupe Palkia so I'm really disappointed with that...