Don't you see? The real Bob was inside you, all along!
Exposition and Knowledge Dumping
Sometimes the GM just needs to give the group a lot of information, and the character with a high Scholarship skill tends to be the conduit of that. When the GM needs to knowledge dump, if you have the highest Scholarship skill, the GM may ask if she can use you as a mouthpiece. Assuming you agree, the GM can share all appropriate background and is encouraged to give you a fate point for having your character temporarily commandeered for the purposes of the story.
-- "Skills", Your Story p.141
But wait, you may say, that's Scholarship. However:
Arcane Research [...]
Other than the subject matter, Lore behaves exactly like the Scholarship skill when it comes to the functions and methods of research, allowing most of Scholarship's trappings [...] to be used, with the focus changed to arcane and occult matters.
-- "Skills", Your Story p.134
Not just the Research trapping of Scholarship: most trappings. So, you don't get arcane Medical Attention or arcane Computer Use, since there really isn't a "focus changed" version of those, but you do get arcane Research, arcane Answers, arcane Declaring Minor Details, possibly arcane Languages if your GM wants there to be multiple languages of magic, and, most usefully for this situation, arcane Exposition and Knowledge Dumping.
So if you just want to knowledge dump - if you're just providing background detail that's common to everyone in the know, not the actionable and advantageous stuff you'd get from looking for Answers - you don't need a Bob. Whoever in your group has decent Lore can be your mouthpiece.
But maybe you don't have a loremaster in your group. That's understandable - Lore tends to be one of those "all or nothing" skills, because that's what you have in the fiction. There isn't the Lore equivalent of "somebody who can take care of themselves in a fight" - there are loremasters, and there are people who need to consult loremasters. In that case, yes, you do need a Bob.
The Bob Emergence
Your description sounds like you're looking for a Bob, not the Bob; since he doesn't come in six-packs, I assume you're trying to come up with a local equivalent. Now, something about Bob that doesn't get a lot of page space in the books is that Bob works in trade. In this information age it's generally not hard for Harry to make that trade, and it's also not something that's dramatic enough to demand a lot of narrative focus, but you can make that principle do some work.
Since you want this to be someone accessible to the entire group, not linked or accountable to one member, you're probably best off introducing it as an Aspect linked to one of the Locations in your city. And -- you know what? Let's stop talking about a thing in general and talk about a thing in specific. Let's talk about an urban legend in your city called Liar's Corner.
The legend is simple enough: somebody's neighbor, or brother-in-law, or it-was-actually-me-I-swear, is having a nice night in a local drinking establishment when this voice from the corner behind them starts saying the most patently wrong things. In short order an argument starts up, but when it comes to the spin-around-dramatically-and-throw-hands part, there's nobody there.
As it turns out (in the course of the investigation that puts a Location and Liar's Corner out into the city) the culprit is a free agent information broker working with all manner of practitioners. They're happy to go by "The Liar" for now, and these incidents are just them gathering information, using the most traditionally reliable means: being wrong
on the Internet in a public drinking establishment.
The simplest way to let the Liar be a Bob to your PCs is to just have that aspect be available for them to spend on when they're trying to do Lore things, basically trying to get Answers with a difficulty based on the Lore they'd need to get Exposition about this in the first place.
But you probably want the Liar to actually be a library, the same way Our World hints that Bob might be capable of being, so your PCs can effectively do arcane Research and get answers even if they're not good enough to get Answers. In that case you're going to need to get a little Extra about things. Maybe something like this:
When you're testing Lore for arcane Answers and willing to discuss matters with the Liar, you can invoke Liar's Corner to roll the Liar's Dice. Roll a separate set of Fate dice; players can reroll or boost either result after the roll as normal, but you can pick the roll you want.
Special: Library-In-Trade. You can effectively "do Research" after failing a Lore roll where you invoked Liar's Corner. This is actually tracking down mortal-realm information the Liar wants in exchange for the answers you were looking for. Finding this information is not risky or dangerous for you, but it is time-consuming - start at "a few hours" and move up the time interval track for every shift you failed by past the first.
Special: Liar's Business. The GM can compel Liar's Corner after you fail a Lore roll to have the Liar's request involve some risk or danger you'll need to scene around. The GM can also compel Liar's Corner for the whole group before you try to invoke Liar's Corner, if you're asking after information where the Liar can't help you - they'll claim they can't divulge it as a result of a previous arrangement.
Special: Liar In Your Corner. This 1-Refresh stunt may be available after further plot at this location and confers all of the following benefits:
- When you invoke Liar's Corner, you can flip one of the Liar's Dice from a ➖ to a ➕.
- When you gather information for the Liar and it isn't risky or dangerous, it takes one fewer unit on the time interval track.
- When the GM compels Liar's Corner against you, they need to give you at least 2 Fate Points to do so.