
#54 PsyduckFirst Appearance: Episode 27 ("Hypno's Naptime")
Even though it is a water-type, Psyduck is Misty's unwanted Pokemon. Misty didn't willingly capture it--when it pecked open one of Misty's Poke Balls, it captured the duck Pokemon and became the property of Misty. It's not very intelligent and is usually useless in battle, and unlike most Psyduck, Misty's Psyduck cannot swim. Misty has offered many times to trade her Psyduck for another Pokemon, but most have declined her offer. Despite its stupidity, Psyduck does have some powerful psychic attacks in battle. These powers, however, only emerge when its headache becomes really painful.
#116 HorseaFirst Appearance: Episode 19 ("Tentacool and Tentacruel")
Misty found Horsea injured in a lake in Episode 19, "Tentacool and Tentacruel." After nursing it back to health, Misty decided to keep it. Horsea is the first Pokemon we see her catch. Like Togepi, it's really a baby and doesn't do much of anything.
#118 GoldeenFirst Appearance: Misty has it with her in Episode 2 ("Pokemon Emergency!")
Goldeen is the first Pokemon that Misty has in the TV show, and is also Misty's least-used Pokemon. Goldeen, to the knowledge of most people, hasn't ever battled. It flopped around in Episode 2 ("Pokemon Emergency!"), but that's about it. Its horn is supposed to be poisonous and is to be feared. Goldeen is very majestic and elegant (like a princess), suiting Misty very well. Well, at least she'd like to think that.

#120 and 121 Staryu/StarmieFirst Appearance: Misty has them in her gym battle with Ash(Episode 7, "The Water Flowers of Cerulean City")
Staryu and its evolved form, Starmie, are rarely used in battle but when they are used, they are usely commanded to use their Water Gun attack or to spin around to cut ropes. Staryu and Starmie both have a jewel on its center that flashes when it becomes weak.