Shingo

Shingo is a character of the day who appeared in Wired For Battle! (EP142). He is the son and student of a great Pokémon Trainer that was once an equal of the Elite Four, Muramasa. Shingo maintained a laptop database on all other Pokémon Trainers who were registered with the Pokémon League. Shingo saw most battles as a waste of time, operating under the belief that he could predict the outcome of any battle just by analyzing the data on his database. Team Rocket attempted to steal the database, but his Scizor swiftly defeated all five of their Pokémon, prompting Ash to convince him once again to battle him by pointing out that data couldn't predict how the battle would affect the Trainer.

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In the subsequent battle, Shingo's Scizor was pitted against Ash's Heracross. Heracross possessed sufficient speed and defensive abilities to oppose Scizor. Although Shingo's database initially helped him calculate what attack would work best against Heracross, Ash began to use more unorthodox strategies, such as telling Heracross to wait for Scizor to attack it rather than simply trying to attack itself. As a result, Shingo found himself unable to look at the computer and the battle at the same time. After Scizor was defeated, he realized that he needed to rethink his fighting strategy and thus abandoned his database project.

(Source: Bulbapedia)