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According to the rules, trained-only skills cannot be used for anything with a DC higher than 10 if you don't have ranks in it. Since the DC to Aid Another is 10, does this mean that a character can use the Aid Another action to aid a Knowledge skill check even if they don't have ranks in that particular Knowledge skill? Or does the particular nature of trained-only skills make them an exception to the Aid Another DC rule?
According to the rules, trained-only skills cannot be used for anything with a DC higher than 10 if you don't have ranks in it.
You can't use a trained-only skill at all unless you have at least 1 rank in it. Only the Knowledge and Sleight of Hand skills work differently.
Since the DC to Aid Another is 10, does this mean that a character can use the Aid Another action to aid a Knowledge skill check even if they don't have ranks in that particular Knowledge skill? Or does the particular nature of trained-only skills make them an exception to the Aid Another DC rule?
Since Knowledge skills work differently than other trained-only skills by actually letting you attempt the check, you can attempt to Aid Another even with no ranks.
However, the GM is well within his rights to rule otherwise:
In cases where the skill restricts who can achieve certain results, such as trying to open a lock using Disable Device, you can't aid another to grant a bonus to a task that your character couldn't achieve alone. The GM might impose further restrictions to aiding another on a case-by-case basis as well.