If you trade a starting pikachu from yellow with pikachu in red, will the pikachu still follow you in yellow?
... A traded Pikachu will also not behave like the starter Pikachu, acting as a regular Pokémon instead (even to the point of being able to evolve with a Thunderstone), unless it matches the OT and Trainer ID number of the player.
Source: Bulbapedia/ Pokemon Yellow Version
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