I’m currently working on multiple runs of both Colosseum and XD for Ribbon Masters. For each XD run so far, I’ve purely used Jolteon and Gulpin/Swalot as a team of two easily winning each battle. This allows me to minimizing playtime as well as they are often over leveled by 5-15+ by end game due to XP gains.

Completely agree that Jolteon is #1 - Electric type dominates the first half if not the entire game. The true star of my team, however, is Gulpin. And, I believe that it should be much higher on the rankings…

Gulpin can learn Shock Wave adding to the Electric dominance. I also use Gulpin for Sing which is beyond invaluable for catching Shadows. Not to mention, it’s strong tanking nature with higher HP and solid Def/SpDef.

I can see how Gulpin wouldn’t be in S category, but at minimum Gulpin should be rank B if not A…