Quick question: Is Zigzagoon as broken as people say?
Is Belly Drum+ES SOOO GOOOD that something with the attack stat of a Sunkern can get banned?
There are multiple problems with Zigzagoon, the first being that there are no good normal resists in the tier (besides larvitar which just dies to coverage), only immunities. The only ghost type that actually outspeeds Zig so it doesn't just die to coverage as well is Gastly, which leads into the second problem: it is incredibly overcentralizing. If teams don't have a CB gastly on their team, they just autolose to Zig. Additionally, because of no team preview, it can be relatively easy to hide a potential Zigzagoon and then bait out the Gastly so you just clean sweep later.
While Zigzagoon may not have the highest base attack stat, it has all the power it needs at +6 and all the coverage it could want to just dominate the tier. For just a comparison of how broken it was, we banned Zig just shortly after Chansey and Omanyte, two other obviously insanely broken mons.