PokéBase - Pokémon Q&A
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Pikachu learned Electro Ball in Unova when fighting a triad of Ducklett. Ash decided that since Volt Tackle was failing him in that season (i.e. Team Rocket, Gym Leaders, and wild Pokemon) he'd instead switch it to Electro Ball.

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Because Pikachu forgot Volt Tackle for Electro Ball, that's why.

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Maybe its because of the new region...the people that decides on what moves should be shown on tv/game wanted to introduce the new moves like discharge and electroball.

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