| This Pokémon was unavailable prior to Generation I.
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| Generation I
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| Red
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Capable of swimming backwards by rapidly flapping its wing-like pectoral fins and stout tail.
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| Blue
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| Yellow
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Touching the back fin causes numbness. It hooks its tail to coral to stay in place while sleeping.
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| Stadium
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A clever Pokémon that can swim backwards while facing forward. Fainting may result from a jab of its sharp spikes.
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| Generation II
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| Gold
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An examination of its cell revealed the presence of a gene not found in Horsea. It became a hot topic.
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| Silver
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Its fin tips leak poison. Its fins and bones are highly valued as ingredients in herbal medicine.
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| Crystal
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The male raises the young. If it is approached, it uses its toxic spikes to fend off the intruder.
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| Stadium 2
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An examination of its cell revealed the presence of a gene not found in Horsea. It became a hot topic.
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| Generation III
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| Ruby
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Seadra sleeps after wriggling itself between the braches of coral. Those trying to harvest coral are occasionally stung by this Pokémon's poison barbs if they fail to notice it.
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| Sapphire
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Seadra generates whirlpools by spinning its body. The whirlpools are strong enough to swallow even fishing boats. This Pokémon weakens prey with these currents, then swallows it whole.
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| Emerald
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The poisonous barbs all over its body are highly valued as ingredients for making traditional herbal medicine. It shows no mercy to anything approaching its nest.
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| FireRed
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Its body bristles with sharp spikes. Carelessly trying to touch it could cause fainting from the spikes.
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| LeafGreen
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It is capable of swimming backwards by rapidly flapping its winglike pectoral fins and stout tail.
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| Generation IV
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| Diamond
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Its spines provide protection. Its fins and bones are prized as traditional medicine ingredients.
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| Pearl
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Its spines provide protection. Its fins and bones are prized as traditional medicine ingredients.
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| Platinum
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{{{platinumdex}}}
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| HeartGold
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{{{heartgolddex}}}
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| SoulSilver
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{{{soulsilverdex}}}
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