Technically both of Zapdos' fast moves are legacy. Can't use TMs to get either Charge Beam or Thunder Shock. Whichever fast move a Zapdos has, it is stuck with it.
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That's bizarre.
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Never knew. Thx for telling.
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Zapdos' page isn't updated sadly. It'd look hilariously bizarre to have nothing under "Fast moves" and to have both TS and CB under "Legacy Fast moves".
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Alolan Exeggutor moves in the description are mixed up as well:
"Bullet Seed or Seed Bomb + Solar Beam"
Seed Bomb is a charge move, not a fast move.