Thunder was introduced in Generation I, where it was in TM25. It has been kept in TM25 throughout every game so far

Pokémon

Level-up

Pokémon Red and Pokémon Blue

• Pikachu at Level 43
• Electabuzz at Level 54
• Jolteon at Level 54
• Zapdos at Level 51

Pokémon Yellow

• Pikachu at Level 41
• Electabuzz at Level 54
• Jolteon at Level 54
• Zapdos at Level 51

Pokémon Gold, Pokémon Silver and Pokémon Crystal

• Pikachu at Level 41
• Electabuzz at Level 58
• Jolteon at Level 52
• Zapdos at Level 73
• Mareep at Level 37
• Flaaffy at Level 45
• Ampharos at Level 57
• Elekid at Level 49
• Raikou at Level 71

Pokémon Ruby, Pokémon Sapphire, Pokémon Emerald, Pokémon FireRed and LeafGreen

• Pikachu at Level 41
• Electabuzz at Level 58
• Jolteon at Level 52
• Zapdos at Level 85
• Mareep at Level 37
• Flaaffy at Level 45
• Ampharos at Level 57
• Elekid at Level 49
• Raikou at Level 71
• Electrike at Level 36
• Manectric at Level 45
• Plusle at Level 37
• Minun at Level 37

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