Draconic knowledge

Warlock Invocation
Level: Least, 2nd lv.
Components: V, S
Casting Time: 1 standard action
Range: Self
Duration: 24 hours
Saving Throw: None
Spell Resistance: No

This invocation gives you access to the great ancestral memories of dragonkind. You gain a +6 bonus on Knowledge and Spellcraft checks for a period of 24 hours, and such checks are treated as though you are trained even if you have no ranks in the skill.

(Complete Arcane, Page 134)