It can't learn Thunder Fang at all.
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Manectric can't learn thunder fang in sapphire because that move doesn't exist in the game only in diamond, pearl, platinum and any other game after those you can teach manectric thunder fang.
yes but you have to give a heart scale to any move teachers
Donphan can learn the following Electric-type moves: Thunder Fang- Move Relearner Hidden Power (Electric)- If Donphan's IVs are correct
Gyrados can learn Ice Fang when leveled up. If you chose TOTODILE as your starter Pokemon, it will also be able to learn Ice Fang.
Castform does not learn Thunder as it levels up. Thunder is a TM that you can teach it. (In Pokemon Emerald, Ruby, or Saphire, you can get Thunder in the Lilycove Department Store.)