Is it possible to manipulate the nature of a event Pokemon?

Question

I got my event dialga and it was a lonely nature. I saved already but for next time I was wondering if I could turn off my game to get a nature I want or get a Pokemon with the synchronize ability.

Answer 1

Yes it is very well possible to get an event Pokemon with a different Nature.

You are only required to do the following
- Receive your Mystery Gift
- Save your game before talking to the Deliveryman
- Keep coming back to him or softreset until he gives you the Nature that you desired for the Pokemon

I have done this multiple times, including with the Deoxys event and it has always worked for me :)

P.S: The Nature of the Pokemon wielding Synchronize will not be passed down to the event Pokemon (as for now)

Source: Experience