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Zackie is a character of the day who appeared in A Bout With Sprout. He is a little boy from Violet City who attends Earl Dervish's Pokémon academy.

Zackie saw Ash's Pikachu, believed he was a wild Pokémon and immediately fought with another student, Lizzy, over him. He pulled on Pikachu's arms and hoped to catch him. During Ash's class presentation, Zackie accused Ash of being a loser for not winning first place in the Indigo League. He later tried to convince Pikachu to leave Ash for him, though Pikachu disagreed. Zackie stole a Poké Ball from Ash's belt and pursued Pikachu into a nearby forest. However, he caught a wild Bellsprout instead.

After escaping from Team Rocket's pitfall trap, Zackie and Ash made their way towards the Sprout Tower. Zackie threw a tantrum and cried after Ash refused his offer to trade, but grew to love Bellsprout after seeing its funny wobbly movements. When Team Rocket attacked the Sprout Tower, his Bellsprout stopped them. Zackie later wished Ash well and hoped to battle him in the future.

(Source: Bulbapedia)