Collector
From Bulbapedia, the community-driven Pokémon encyclopedia.
A Collector (Japanese: ポケモンコレクター Pokémon Collector) is a type of Pokémon trainer that first debuted in the Generation III games. They are generally depicted as overweight nerdy young men carrying many Poké Balls.
In Generation III, they use version-exclusive Pokémon, and in Generation IV, they usually use three Pokémon of the same species. They often talk about how they wish to catch rare Pokémon.
Appearance
 Image from Pokémon Ruby and Sapphire |  Image from Pokémon Diamond and Pearl |
In the anime
Lawrence III called himself a collector. While his design is different from that of the trainer class, he shares the common interest in rare Pokémon.
Subsequently, there is a song recorded for The Power of One in Japanese with the name I Am a Collector.
