Tetsuya

The Wobbuffet Festival crashers are characters of the day who appeared in Wobbu-Palooza! (EP175). Individually in Japanese, they are known as ツヨシ Tsuyoshi, テツヤ Tetsuya, and ヒサシ Hisashi. Their Japanese names were revealed through closed captioning, while in the closed captions for the English dub on Prime Video, they are referred to as Pretty Boy, Greaser, and Red Spikes, respectively.

The trio trains Fighting-type Pokémon. They had previously attacked the Wobbuffet Village, during which they used their Pokémon to attack the village in order to build up their strength. They were eventually repelled by Lulu and her Wobbuffet. A full year later, the three boys attacked many innocent Wobbuffet during the Wobbuffet Festival again. Even though Pokémon battles are not allowed during the Festival, Ash and his friends drove the trio out of the village with unexpected help from Team Rocket.

They each seem to resemble the Pokémon they use in both stature and hairstyle (the one with Hitmonlee having rounded hair, for example).

(Source: Bulbapedia)