http://nuggetbridge.com/articles/teams-vgc-14-united-states-national-championship/

Pokémon Number Used % of Teams
Kangaskhan 20 43.48%
Aegislash 16 34.78%
Garchomp 16 34.78%
Rotom-Heat 15 32.61%
Talonflame 12 26.09%
Rotom-Wash 11 23.91%
Salamence 11 23.91%
Venusaur 10 21.74%
Azumarill 9 19.57%
Hydreigon 9 19.57%
Ludicolo 9 19.57%
Mawile 9 19.57%
Amoonguss 8 17.39%
Gardevoir 7 15.22%
Politoed 7 15.22%
Chandelure 6 13.04%
Scrafty 6 13.04%
Bisharp 5 10.87%
Charizard 5 10.87%
Gyarados 5 10.87%
Lucario 5 10.87%
Tyranitar 5 10.87%
Zapdos 5 10.87%
Aerodactyl 4 8.70%
Meowstic 4 8.70%
Blastoise 3 6.52%
Gengar 3 6.52%
Conkeldurr 2 4.35%
Crobat 2 4.35%
Ferrothorn 2 4.35%
Goodra 2 4.35%
Kingdra 2 4.35%
Lapras 2 4.35%
Mamoswine 2 4.35%
Manectric 2 4.35%
Sableye 2 4.35%
Scizor 2 4.35%
Smeargle 2 4.35%
Staraptor 2 4.35%
Weavile 2 4.35%
Abomasnow 1 2.17%
Aromatisse 1 2.17%
Audino 1 2.17%
Drapion 1 2.17%
Electrode 1 2.17%
Espeon 1 2.17%
Gigalith 1 2.17%
Gothitelle 1 2.17%
Greninja 1 2.17%
Hawlucha 1 2.17%
Heliolisk 1 2.17%
Klefki 1 2.17%
Krookodile 1 2.17%
Mienshao 1 2.17%
Moltres 1 2.17%
Poliwrath 1 2.17%
Reuniclus 1 2.17%
Sawk 1 2.17%
Sylveon 1 2.17%
Gourgeist 1 2.17%
Jolteon 1 2.17%
Medicham 1 2.17%
Nidoking 1 2.17%
Glaceon 1 2.17%
Yanmega 1 2.17%

>that huge decline in Charizard usage