This Pokémon was unavailable prior to Generation I.
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Generation I
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Red
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Because it stores several kinds of toxic gases in its body, it is prone to exploding without warning.
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Blue
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Yellow
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In hot places, its internal gases could expand and explode without any warning. Be very careful!
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Stadium
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A Pokémon that is like a thin-skinned balloon filled with a highly toxic gas. Known to occasionally explode.
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Generation II
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Gold
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Its thin, flimsy body is filled with gases that cause constant sniffles, coughs and teary eyes.
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Silver
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The poisonous gases it contains are a little bit lighter than air, keeping it slightly airborne.
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Crystal
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If one gets close enough to it when it expels poisonous gas, the gas swirling inside it can be seen.
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Stadium 2
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Its thin, flimsy body is filled with gases that cause constant sniffles, coughs and teary eyes.
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Generation III
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Ruby
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If Koffing becomes agitated, it raises the toxicity of its internal gases and then jets them out from all over its body. This Pokémon may overinflate its round body, then explode.
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Sapphire
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Koffing embodies toxic substances. It mixes the toxins with raw garbage to set off a chemical reaction that results in a terribly powerful Poison Gas. The higher the temperature, the more gas is concocted by this Pokémon.
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Emerald
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Getting up close to a Koffing will give you a chance to observe, through its thin skin, the toxic gases swirling inside. It blows up at the slightest stimulation.
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FireRed
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Its thin, balloon-like body is inflated by horribly toxic gases. It reeks when it is nearby.
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LeafGreen
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Because it stores several kinds of toxic gases in its body, it is prone to exploding without warning.
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Generation IV
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Diamond
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Lighter-than-air gases in its body keep it aloft. The gases not only smell, they are also explosive.
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Pearl
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Lighter-than-air gases in its body keep it aloft. The gases not only smell, they are also explosive.
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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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