Switching gears to the bottom of the barrel real quick, it looks like there's a consensus on the worst 5 being Dragon, Poison, Bug, Fire, and Fighting. If we can hammer out the actual order for these, we'll be able to focus on the middle bunch.
Probably the most important thing to figure out here is whether or not the effectiveness of Pokemon belonging to one of these types in OU, despite the typing itself being only a hindrance, is enough to place it above others. In other words, does Poison get a boost because Gengar and Victreebel can still find uses, even though their Poison typing only adds major weaknesses, brings zero coverage, and actively holds them back?
I'm also going to remind people that ties are allowed, although it's obviously best if they can be avoided. Bug and Fighting are probably the closest things to a tie in these rankings, as they both only really offer coverage moves to Jolteon. I'd probably give the edge to Fighting personally, as there are at least super niche Fighting-types that could find use on some teams, but the difference is really minor at that point (arguably which coverage move is more valuable to Jolteon has more of in impact.)
Probably the most important thing to figure out here is whether or not the effectiveness of Pokemon belonging to one of these types in OU, despite the typing itself being only a hindrance, is enough to place it above others. In other words, does Poison get a boost because Gengar and Victreebel can still find uses, even though their Poison typing only adds major weaknesses, brings zero coverage, and actively holds them back?
I'm also going to remind people that ties are allowed, although it's obviously best if they can be avoided. Bug and Fighting are probably the closest things to a tie in these rankings, as they both only really offer coverage moves to Jolteon. I'd probably give the edge to Fighting personally, as there are at least super niche Fighting-types that could find use on some teams, but the difference is really minor at that point (arguably which coverage move is more valuable to Jolteon has more of in impact.)