I'm not suggesting for anything to rise or drop, but I kind of just want to stress how really cool Heliosk is in the current meta, and how I feel like a lot of people kind of shrug it off as just another Electric-type. In my opinion, I think it's a lot more effective than Jolteon at the moment. While Jolteon may be faster, Heliosk has an insanely good movepool which complements its STAB moves very well. Jolteon on the other hand has complete ass coverage and outside of STAB, HP Water, and Shadow Ball (which doesn't really give it much coverage anyway). Specs is strong, but it absolutely hates being locked into any move that isn't of the Electric-type, and even then it's very susceptible to the plethora of Ground-types in the tier. The massive influx of Mega Steelix only further complicates things as well.
Other than the massive Speed difference (which really isn't too significant now that Mega Pidgeot and Serp are gone) Heliosk has everything Jolteon wishes it had; good coverage, Dual STAB, and an arguably more useful ability. The combination of Volt Switch/T-Bolt, Surf, Focus Blast, and Hyper Voice makes Heliosk very difficult to switch into outside of super bulky shit like Cresselia and bulky Melo. Its coverage moves are strong enough where it doesn't need to run Specs and can simply run Life Orb for extra oomph. Jolteon is extremely predictable and its shitty coverage keeps it from being able to pressure bulkier teams like Heliosk can. Heliosk's ability to hit a wider range of Pokemon such as Grass-types, Mega Steelix, Tyrantrum, and Druddigon is just very useful and allows you to keep up the offensive momentum much more effectively without having to rely as much on prediction or Volt Switching at the right times. Also I'm not saying that Volt Absorb is a bad ability, but Dry Skin is just so much more useful considering how common Scald is, allowing it to switch into the likes of Alo and defensive Slowking with impunity. It's also a great check to SD Aqua Jet Gator, and it's Normal-typing, while a double-edged sword, allows it to be a great check to Doublade and STAB Hyper Voice 2HKOs most bulky Grass-types.
All in all, I think Heliosk should get a lot more recognition. Jolteon always seems to be considered the better of the two when the only thing I really see it having over Heliosk is higher Speed and BP I guess. It just seems like Heliosk's far superior coverage and other useful attributes is far more useful than Speed though, and even then, 109 Speed is still very fast and the only thing VERY significant that Heliosk misses out on are Dugtrio and Scarf Emboar.
I could just be talking about of my ass here, but when choosing an Electric-type for my team, Heliosk and Rotom-C always seem to be far more useful than Jolteon, especially the former.