First you need a light ball then give it to your female Pikachu afterthat you need a Pokemon in the fairy egg group like Pichu or another pikachu then breed them by going to the day care centre after they have layed their egg get it from the old man outside the day care centere and hatch it if your pichu knows volt tackle then evolve it.
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Electivire cannot learn Volt Tackle in Pokemon HeartGold. Only pichu, pikachu, and raichu can learn volt tackle.
you will need to breed a female pikachu or raichu that holds a light ball with a compatible pokemon. the egg will be a pichu that has volt tackle.
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It can usually learn egg moves. They are moves they get from there mum and dad Pokemon such as volt tackle, which can be gained when giving a light orb to the father Pikachu before breeding.