Apologies if this this the wrong place. I am new to Pathfinder and this forum.
The appendix evil trait says a creature must be evil to use any ability with the evil trait. Abilities in the appendix list spells, and creatures in the appendix include PCs.
Therefore, a netural or good sorcerer with the diabolic blood line can't use focus spells, even though some of those spells suggest the player doesn't need to be evil.
Occult spell list has about 15 less spells for non evil folks.
I think this is an oversight