There's one in core, it's called Spell Mastery. The downsides include the very small number of spells this would give you to memorize (even if you took it for every feat, ever), and the fact that you have to "already know" those spells, which would be rather difficult with no spellbook to add them to in the first place.
What about a Shadowcraft Mage with the Illusion Mastery wizard variant? Hell, even without it, silent image does everything.
And a VoP dragon is...huh. I can't even comprehend that, a dragon with no hoard. A dragon who has given up his hoard to charity. That's one of the signs of the apocalypse, I think.
Fluff: the dragon's sacrifice of material possessions is only made more meaningful by their racial love of treasure!
If the Dragon in question has innate spellcasting ability, they don't need material components. If it's sorcerer-based, they don't need a spellbook. Forcecage spam ahoy. Of course, said VoP dragon couldn't do anything better than a dragon covered with magic shinies, but they're not
that crippled by VoP at high levels, are they?
VOP is also nice on a cohort if the DM lets you be so cheesy
Pffft. Familiars get feats, don't they?
Heh, you could even do this with a Dragon Cohort or Dragon Familiar.