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Ash's Fearow was one of the major alterations from the anime in The Electric Tale of Pikachu. It was the first wild Pokémon Ash caught in this canon. It stays Ash's major Flying-type, as his Pidgeotto abandons him early on.
Fearow was a leader of a group of Spearow, which attacked and exhausted Ash's Pikachu. However, Pikachu beat Fearow with a Thunder Shock, so Ash was able to catch it, turning Fearow into one of his most used Pokémon in this manga, staying with him the entire way. In Play Misty For Me, Ash attempted to have it battle against Misty at the Cerulean Gym (during which he had to get his hat back from her), but it came out with a sign around its neck saying "Sleeping. Do not disturb." Only when Ash throws its favorite food, a soy sauce-covered dumpling, at Misty does it actually do anything.
When Ash returned to Pallet Town in Pallet Party Panic, this Fearow was again causing trouble, this time for a flock of Pidgey and Pidgeotto. After his own Pidgeotto became a Pidgeot, Ash attempted to capture the Fearow while riding on Pidgeot's back. Despite its weakened state, he was still unable to capture it, and left Pidgeot behind to guard against any future attacks.
Spearow reappeared in I Choose You!, which is set in a timeline separate from the main series. It fulfilled the same role it had in the debut episode of the main series.
Fearow led a flock of Spearow sometime prior to evolution after Ash threw a rock at it. The leader Spearow called out its flock to attack Ash and Pikachu. It continued to do so even after evolving as shown by its next appearance.