to get the boost from Knowledge Devotion.... you only need these Knowledge Skills:
Arcana (ancient mysteries, magic traditions, arcane symbols, cryptic phrases,
constructs, dragons, magical beasts)
Dungeoneering (
aberrations, caverns,
oozes, spelunking)
*Local (legends, personalities, inhabitants, laws, customs, traditions,
humanoids)
Nature (
animals, fey, giants, monstrous humanoids, plants, seasons and cycles, weather,
vermin)
Religion (
gods and goddesses, mythic history, ecclesiastic tradition, holy symbols,
undead)
The planes (the Inner Planes, the Outer Planes, the Astral Plane, the Ethereal Plane,
outsiders, elementals, magic related to the planes)
Ranger gives dungeoneering/nature
Monk gives arcana/religion
Knowledge Devotion can give one more.... i would suggest
The Planes*Local may not be used by some DMs..... check with yours first to see if its needed
although to avoid any problems.... just take the feats:
Education(makes All Knowledge Skills class skills) and
Knowledge Devotion... then there is no problem