The only way for Pikachu to know Volt Tackle is to have learned it as a Pichu, which is possible only if one of the Pichu's parents breeds while holding the Light Ball. To have a Pikachu learn Volt Tackle, you need to start with a baby Pichu and acquire a Light Ball.Continue Reading
The only way to get a Light Ball in Pok��mon Fire Red is to find it as a held item. The most common location to find a Pikachu is the Power Plant, where they can be found roughly 25 percent of the time. Alternately, a Light Ball can be found if the starting Pikachu from Pok��mon Yellow is traded up to Gold/Silver/Crystal and then traded again to Fire Red.
To receive a baby Pichu, one of the bred Pok��mon must be a female Pikachu. There are many other options for the male Pok��mon, including another Pikachu, or Ampharos, Ditto, Plusle or Clefairy.
In order to breed Pok��mon, you must have seen or captured 60 or more Pok��mon, defeated the Elite 4, received the National Dex from Professor Oak, and retrieved the Ruby from Mt. Ember. Doing so unlocks the post game Island four. The day care center can be found here. Leave the two Pok��mon here, and proceed to walk around until they produce an egg. Remember to give one of the parents the Light Ball to hold while breeding.