Rules for a resisted alignment change?

Question

As Pathfinder has quite a few special case rules, but I didn't find anything when I searched I'm wondering: Are there any (core or supplement) rules for an resisted permanent alignment change (either by number (good 3, good 2,...) or by value ("good, chaos",..))?

Thus any rules on how an alignment change could be resisted (if induced non voluntarily by any means)

Edit: As it was asked: I meant something like spells, supernatural abilities and template changes (although most spells have their own unique resistance as far as I'm aware).

Answer 1

When a character's alignment is changed by a spell, magic item or supernatural ability, the rules which describe that effect should mention if they allow a saving throw and what kind of saving throw. When no way to resist the change is explicitly mentioned, then there is no way to prevent it. The only way to "cure" your alignment change is finding some effect which changes your character's alignment in the opposite direction.

Different tables have different attitudes towards alignment. Some say that behavior affects alignment, others that alignment affects behavior. When your group belongs to the first category, you might be able to "fix" your new alignment by acting contrary to it. When your group belongs to the second kind, acting contrary to your new alignment might be considered bad roleplaying by the group, because your character is expected to act according to their new alignment.

Answer 2

Normally, effects that shift your alignment are clearly defined, like turning into a vampire (no save), or holding a cursed item (will save), or being corrupted by some nightmarish unknown force (several different saves). The conditions of what else can alter a character's alignment are usually left to GM discretion.

The Pathfinder Unchained book gives us some (optional) rules about alignment shifts. Basically, each axis (lawful-chaotic and good-evil) get a 9-step progression that goes from left (lawful and good) to right (chaotic and evil). Each action a character does that is strongly tied to an alignment will move the character one step into that direction, after 3 steps into a single direction (left or right), the character alignment has shifted.

I won't discuss the details or merits of these rules, you should read them and come to a conclusion by yourself if you will use these rules or not, as alignment is usually a sensitive topic and if you ask an alignment question to ten different people you will get ten different answers about it.