Search results for query: *

Synchronize only makes the nature the same as the user's, and it's only guaranteed for eggs and gift Pokemon-wild Pokemon still have a 48% chance of having a different nature. A way to summon Pokemon that are guaranteed to have any nature you want (as opposed to having 21 different Synchronize...

I think it's because Pokemon are immediately healed when you put them in the PC, which would mean you could heal your party completely at any point.