Either look it up on serebii.net or just buy thunder on the 3rd floor of the veilstone department store
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it dosent learn thunder but at level 15 it learns thunder shock
Espeon does not learn Thunder. Jolteon learns it, however.
Jolteon cannot learn Thunderbolt through leveling up. It can, however, learn Thunderbolt with the use of a TM.
Raichu will not learn thunder.... but pikachu can learn it at level 45
In Leaf Green: This is kinda vague but it learns double kick at like lvl 30 and thunder at like 49 and probably some others after that