| This Pokémon was unavailable prior to Generation I.
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| Generation I
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| Red
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Its hard shell repels any kind of attack. It is vulnerable only when its shell is open.
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| Blue
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| Yellow
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The shell can withstand any attack. However, when it is open, the tender body is exposed.
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| Stadium
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Its shell is harder than diamond. It hides in sand on the sea floor and catches prey with its soft tongue.
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| Generation II
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| Gold
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It swims facing backward by opening and closing its two-piece shell. It is surprisingly fast.
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| Silver
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Grains of sand trapped in its shells mix with its body fluids to form beautiful pearls.
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| Crystal
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Clamping on to an opponent reveals its vulnerable parts, so it uses this move only as a last resort.
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| Stadium 2
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It swims facing backward by opening and closing its two-piece shell. It is surprisingly fast.
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| Generation III
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| Ruby
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At night, this Pokémon uses its broad tongue to burrow a hole in the seafloor sand and then sleep in it. While it is sleeping, Shellder closes its shell, but leaves its tongue hanging out.
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| Sapphire
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At night, this Pokémon uses its broad tongue to burrow a hole in the seafloor sand and then sleep in it. While it is sleeping, Shellder closes its shell, but leaves its tongue hanging out.
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| Emerald
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At night, it burrows a hole in the seafloor with its broad tongue to make a place to sleep. While asleep, it closes its shell, but leaves its tongue hanging out.
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| FireRed
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It is encased in a Template:A2. Inside, however, it is surprisingly tender.
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| LeafGreen
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Its hard shell repels any kind of attack. It is vulnerable only when its shell is open.
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| Generation IV
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| Diamond
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It swims backward by opening and closing its two shells. Its large tongue is always kept hanging out.
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| Pearl
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It swims backward by opening and closing its two shells. Its large tongue is always kept hanging out.
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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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For other sprites and images, please see Shellder images on Bulbagarden Archives.