No. It is impossible without a cheat(maybe).
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Electivire cannot learn Volt Tackle in Pokemon HeartGold. Only pichu, pikachu, and raichu can learn volt tackle.
no
You can only get Volt Tackle by breeding Pikachu or Raichu with the Light Ball item attached to them however 1 of them has to be a female Pikachu or Raichu so that they can lay a Pichu Egg that will know Volt Tackle when it hatches.
yes
It doesn't. give pikachu or raichu a light ball breed and the baby pichu will know volt tackle