I saw on Reddit that someone hatched a Pichu with an Ash hat during the one year anniversary event. In previous hat events, Pichu couldn't hatch with a hat.
Someone in the Reddit claimed they hatched an egg they received during the event and didn't get a Pichu with a hat:
Got an egg during the event and hatched it last night for a Pichu without a hat.
Is it possible to hatch one with a hat and if so, is it guaranteed to have a hat during the event or random?
Best Answer
YES, you can.
I hatched one this morning from a 2k egg, which I believe I got yesterday (i.e. after the "event" began). I've taken a screenshot, with the pichu at an angle for authenticity. ;)
I didn't realize it was possible, as the previous two hatted pikachus came before the baby pokemon were added.
Not sure if you have a definite chance of getting one with a hat or not, unfortunately.