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The Wobbuffet Festival crashers are characters of the day in the episode Wobbu-Palooza!. Individually in Japanese, they are known as ツヨシ Tsuyoshi, テツヤ Tetsuya, and ヒサシ Hisashi. Their individual names in English are unknown, but they still have their original names as seen in the closed captioning of the episode.
The male trio train Fighting-type Pokémon. They previously attacked the Wobbuffet Village where they used their Pokémon to attack the village in order to build up their strength. They were repelled by Lulu and her Wobbuffet. One year later, the three boys attacked many innocent Wobbuffet during the Wobbuffet Festival. 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 hair style (the one with Hitmonlee having rounded hair, for example).