This item is a Pokémon playmat, featuring art by the name of Pikachu Power Grid.
The playmat depicts the Electric-type Pokémon Pikachu introduced in Generation I, Pachirisu from Generation IV, Minun and Plusle from Generation III, and the dual-type Electric/Steel Togedemaru from Generation VII, and Electric/Flying Emolga from Generation V.
This item is very rare and special.
The playmat size is around 35cm x 60cm.