Zapdos @ Leftovers
EVs: 248 HP / 176 Def / 68 SpA / 16 Spe
- Heat Wave
While Weavile absolutely enjoys the company of various offensive powerhouses, it still appreciates something to get it in on the things it threatens -- because while Weavile excels at getting KOs on things that are weak to its STABs, it absolutely does not excel at taking Garchomp's Earthquakes or Latios's Draco Meteors or Jirachi's Iron Heads. Normally, Zapdos is basically countered by threats such as Lando-T, Lati@s, Garchomp, SpD Jirachi, Hippowdon, and Mew. However, with U-Turn, it can pivot out of even the Ground-types into a Weavile that can nab the KO, hit the switch-in, or set up a swords Dance on its prey. It's best used on the switch, of course.
As side benefits, by foregoing Defog to make room for U-Turn, Zapdos can run Static and give the opponent serious second thoughts about clicking Fighting-type attacks against your team (or before it's revealed, just have a Scald's worth of chance to paralyze a threat). It's also a great switch-in to Mega Scizor and Mega Lopunny, which both give Weavile problems.