Chained Sync: Invalid?

[foolosophy]

Hey,

I chained six Shinx earlier today and decided to legal check them (despite knowing they were obviously legit). Oddly enough 5 of them passed with all Valid, but one came up Invalid under the category Chained Sync. Anyone know what would cause this to happen?

[randomcouchpotato]

as far as i know, in the chained sync section, valid means that synchronize worked and the pokemon has the same nature as the syncher and invalid means that synchronize didnt work and the pokemon doesnt have the same nature as the syncher

[foolosophy]

But I wasn't using a synchronizer and the other 5 shinx had different natures but all showed up Valid under Chained Sync.

[OmegaDonut]

The "Sync Check" actually has nothing to do with Synchronize. In DPPt, certain "legitimate" IV\nature spreads are actually skipped and cannot be encountered at all.

Pokemon you encounter through certain in-game events, like gift Pokemon (Eevee, Porygon, Dialga\Palkia\Giratina from the Arceus event, etc. and roamers) have all ~4.2 billion spreads available to them. But for everything else (including wild encounters and battles with non-roamer legendaries), the generation method skips over some of these "legitimate" spreads, so they can never be found on a wild Pokemon. The Sync Check makes sure the spread is not one of those skipped spreads.

I'm certain not even Sabresite knows exactly how the game determines what chained shiny spreads can be hit or not. That's why the Sync Check will fail on some chained shinies.