Blue of Pokémon Special had a Horsea on her team, using it in her crafty tricks such as cloaking areas with SmokeScreen or leaving ink trails. It was later transferred to Silver, and eventually evolved into Kingdra.
Horsea eats small insects and moss off of rocks. If the ocean current turns fast, this Pokémon anchors itself by wrapping its tail around rocks or coral to prevent being washed away.
If Horsea senses danger, it will reflexively spray a dense black ink from its mouth and try to escape. This Pokémon swims by cleverly flapping the fins on its back.
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Horsea and its evolutions share the same species name with Dratini and its evolutions and Salamence. They are all known as Dragon Pokémon.
Although Horsea is not a Dragon-type, it is a Dragon species Pokémon. It shares this trait with it's evolved form Seadra.
In Pokémon Mystery Dungeon, Horsea claims that its Water Gun always hits. However, if its Accuracy is lowered, its Water Gun will eventually miss. This also counts for when Horsea is confused.
Origin
It is, obviously, based on a seahorse, though its ability to shoot ink resembles that of a squid.
Name origin
Horsea's name is based on seahorse and the diminutive word horsie. Its Japanese name is a misspelling of 竜 tatsu, dragon, which is part of the common name of a seahorse in Japanese, 竜の落し子 tatsu-no-otoshigo, lit. illegitimate child of a dragon.
This Pokémon article is part of Project Pokédex, a Bulbapedia project that aims to write comprehensive articles on each Pokémon species, as well as Pokémon groups and forms.