Squirtle, Wartortle, Blastoise, Psyduck, Golduck, Poliwag, Poliwhirl, Poliwath, Poltoed, Seel, Dewgong, Shellder, Cloyster, Krabby, Kingler, Horsea, Seadra, Kingdra, Goldeen, Seaking, Staryu, Starmie, Magikarp, Gyarados, Vaporeon, Totodile, Croconaw, Feraligatr, Marill, Azumarill, Remoraid, Octillery, Suicune, Mudkip, Marshtomp, Swampert, Wailmer, Wailord, Corphish, Crawdaunt, Feebas, Milotic, Castform (Rain), Clamperl, Huntail, Gorebyss, Luvdisc, Kyogre, Piplup, Prinplup, Empoleon, Buizel, Floatzel, Shellos, Gastrodon, Finneon, Lumineon, Phione, Manaphy, Oshawott, Dewott, Samurott, Panpour, Simipour, Tympole, Palpitoad, Seismitoad, Basculin, Alomomola, Tentacool, Tentacruel, Slowpoke, Slowbro, Slowking, Lapras, Chinchou, Lanturn, Wooper, Quagsire, Qwilfish, Corsola, Mantyke, Mantine, Lotad, Lombre, Ludicolo, Wingull, Pelipper, Carvanha, Sharpedo, Barboach, Whishcash, Relicanth, Palkia, Tirtouga, Carracosta, Ducklett, Swanna, Frillish, Jellicent, Keldeo, Omanyte, Omastar, Kabuto, Kabutops, Surskit, Spheal, Walrein, Bibarel and Rotom-Wash.
Gyarados is a water type. Water type Pokemon are weak when battling a grass type Pokemon.
Water type Pokemon are weak to electric type Pokemon.
Milotic is a Water type Pokemon.
Clamperl is a Water type pokemon.
Prinplup is a Water type pokemon.
If you're talking about the starter pokemon, they do have names. The water type (the bear) is called Oshawott. The grass type (the leafy snake)is called Snivy and the fire type (the red pig) is called Tepig.
Mudkip is a Water type pokemon.
Gyarados is a water type. Water type Pokemon are weak when battling a grass type Pokemon.
Surskit is a water type and bug type pokemon.
your starter pokemon can be a water type and you can trade water type pokemon with your friends in pokemon ruby
Water type Pokemon are weak to electric type Pokemon.
Electric
Buizel is a Water type pokemon.
Phione is a Water type pokemon.
Totodile is a Water type pokemon.
Dewott is a Water type pokemon.
Squirtle is a Water type pokemon.