Just as an aside, would Flare Boost work as a pseudo Flash Fire? I mean it would certainly make WRotom think twice before using WoW, leaving it with only NVE moves, and you could switch in on WoW or even carry Flame Orb for a handy boost and resistance to Spore/Twave.
I didn't get where you were going with this at all at first (way back in post #8), but now that I've read this justification for it, I actually sort of like it. It keeps in with the flavor, and it provides an interesting option to specially offensive sets, but it doesn't include that fire immunity that everybody seems so scared of. Honestly, I think that people are overreacting to Heatran not being a great counter anymore if it gets Flash Fire. Sketchy would still have exploitable typing weaknesses (Dark, Flying, Ghost, Ice), and it seems to me like people just got too attached too soon to the idea of Heatran being a counter, even though that discussion was only supposed to be a speculative look forward and not a strictly guiding element of the CAP. Still, if people still don't like it, then people don't like it. C'est la vie. Anyway, if we're looking not to give Sketchy anything too powerful or significant for fear of overpowering it, then
Flare Boost does seem like a creative and flavorful way to go.
Though I edited this back into my first post after seeing some of the suggestions from other posters, I want to mention it again since I'm already posting anyway and so that I can elaborate:
I don't think that we should be reusing the same generically useful abilities that have been used by CAP before. Specifically, I'm looking at Compoundeyes, Limber, Rock Head, Shed Skin, Shield Dust, and Technician. I can even certainly understand the justification behind Compoundeyes, Rock Head, and Technician, considering that Sketchy really is in a very unique position to make good use of those abilities, but I don't think that we should consider reusing abilities like Limber, Shed Skin, and Shield Dust that are not central to or necessary for Sketchy's success, especially because I don't feel like they do very much to teach us about our selected concept. If we want an ability to help Sketchy against status (and I can certainly understand that desire, after all part of why I suggested Flash Fire was help against it being burned), then there are more interesting and unique abilities that we should consider, even if they may be inferior, such as Leaf Guard, Natural Cure, or (my favorite of these particular ideas right now)
Wonder Skin. The important thing is that we want CAP to teach us new things, and that's not going to happen if abilities are always selected from a pool of our twenty or so favorites. Sure, repeating ability once wouldn't be the end of the world, but it's not a precedent that I think should be set so soon.
If, however, we really do want an ability that directly affects what we might decide to Sketch, then we still have a lot of other great options out there besides reusing Compoundeyes, Rock Head, or Technician, as tempting as those may be. Skill Link was brought up earlier on, but more recently, reachzero has made fantastic arguments for
Iron Fist. I actually in the same boat as bugmaniacbob in that I really dislike it flavorfully speaking, but I do have to admit that it's a pretty good idea. My only worry is that I don't want every set to simply sketch a Fighting move so that it gains perfect coverage with its existing Ghost STAB. This isn't supposed to be just a 5th generation Revenankh.
EDIT: I want to talk statistic here for just a second. Maybe somebody can tell me what I'm missing...
By my count, 4/46 (~9%) existing OU Pokemon are immune to the paralyzing effects of Thunder Wave (I call out Thunder Wave because it's the most common and reliable way of inducing paralysis),
all of which are so immune due to their Ground typing.
0/46 (0%) existing OU Pokemon are immune to paralysis altogether.
On the other hand, 4/12 (~33%) existing CAPs are immune to the paralyzing effects of Thunder Wave, only
half of which are so immune due to their Ground typing.
If we are seriously considering making a
second CAP immune to paralysis altogether, then I think that it may be safe to say that we're just a little bit too worried about Thunder Wave and paralysis.
Despite the popularity of the suggestion, these numbers only make me even more skeptical of Limber.