Players representing more than 30 countries in six age-related categories battled for the titles of Pokémon Trading Card Game and video game World Champions.
Trading card champions include Japan's Shuto Itagaki, Abram Burrows from the USA and Chase Moloney from Canada.
Video game champions, meanwhile, were made up of Americans Toler Webb and Ray Rizzo, while Portugal's Igor Costa won the Master's division.
Winners picked up a Pikachu World Championships trophy, and collectively earned more than $100,000 in scholarships.
Select finalists and their teams will be available to play against in upcoming sequel Pokémon Black 2 and Pokémon White 2, which will be available from October 5 in North America and October 12 in Europe.
The games are set two years after their predecessors and see players return to the region of Unova.
The world has undergone numerous changes since the previous games, and will play host to new characters.
Nintendo recently unveiled a Pokémon-themed 3DS XL for release in Japan.
Obtainable only by customers who pre-order, the branded system will be available exclusively from Japan's Pokémon Centre stores from September 15.
The Pikachu 3DS XL's release marks the launch of the first themed 3DS XL. Nintendo previously launched Zelda and Monster Hunter-themed models of the standard 3DS.
Watch a trailer for Pokémon Black 2 and White 2 below: