As a Pokémon expert with extensive knowledge of the franchise's mechanics, I can tell you that the move
Volt Tackle is not a standard move that Pikachu learns through leveling up in the main series games. Instead, Pikachu learns a variety of Electric-type moves as it levels up, such as
Thunder Shock at level 5,
Quick Attack at level 8, and its signature move
Thunderbolt at level 22, among others.
However, in some spin-off games or special events, Pikachu might have access to different moves. For example, in the Pokémon Stadium games, Pikachu could learn Volt Tackle through the move replay feature. But in the main series games, Pikachu does not learn Volt Tackle through leveling up.
To summarize, in the main series Pokémon games, Pikachu does not learn
Volt Tackle by leveling up. The move list for Pikachu is determined by the game version and any special events or distributions that might alter the move pool.
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