I know how to get Volt Tackle, but in which games can Pikachu learn Volt Tackle?
Nope, Pikachu can't learn Volt Tackle in Pokemon Fire Red. It can only learn it in Emerald by Breeding. Look here:
http://www.serebii.net/emerald/volttackle.shtml
No, the only games that a Pichu can learn Volt Tackle are:
Emerald Diamond Pearl Platinum Heartgold Soulsilver Black White
