TM18 Rain Dance in Emerald.

Rain Dance. A TM is used up when taught; one copy, one Pokemon. 268 species in Pokemon Emerald can learn it.

Squirtle, Wartortle, Blastoise, Butterfree, Pidgey, Pidgeotto, Pidgeot, Rattata, Raticate, Spearow, Fearow, Ekans, Arbok, Pikachu, Raichu, Nidoran (female), Nidorina, Nidoqueen, Nidoran (male), Nidorino, Nidoking, Clefairy, Clefable, Jigglypuff, Wigglytuff, Zubat, Golbat, Meowth, Persian, Psyduck, Golduck, Mankey, Primeape, Poliwag, Poliwhirl, Poliwrath, Abra, Kadabra, Alakazam, Machop, Machoke, Machamp, Tentacool, Tentacruel, Slowpoke, Slowbro, Magnemite, Magneton, Seel, Dewgong, Grimer, Muk, Shellder, Cloyster, Gastly, Haunter, Gengar, Drowzee, Hypno, Krabby, Kingler, Voltorb, Electrode, Hitmonlee, Hitmonchan, Lickitung, Koffing, Weezing, Rhyhorn, Rhydon, Chansey, Kangaskhan, Horsea, Seadra, Goldeen, Seaking, Staryu, Starmie, Mr. Mime, Scyther, Jynx, Electabuzz, Pinsir, Tauros, Gyarados, Lapras, Eevee, Vaporeon, Jolteon, Flareon, Porygon, Omanyte, Omastar, Kabuto, Kabutops, Aerodactyl, Snorlax, Articuno, Zapdos, Moltres, Dratini, Dragonair, Dragonite, Mewtwo, Mew, Totodile, Croconaw, Feraligatr, Sentret, Furret, Hoothoot, Noctowl, Crobat, Chinchou, Lanturn, Pichu, Cleffa, Igglybuff, Togepi, Togetic, Natu, Xatu, Mareep, Flaaffy, Ampharos, Marill, Azumarill, Politoed, Aipom, Wooper, Quagsire, Espeon, Umbreon, Murkrow, Slowking, Misdreavus, Girafarig, Dunsparce, Gligar, Snubbull, Granbull, Qwilfish, Scizor, Heracross, Sneasel, Teddiursa, Ursaring, Swinub, Piloswine, Corsola, Remoraid, Octillery, Delibird, Mantine, Kingdra, Porygon2, Stantler, Tyrogue, Hitmontop, Smoochum, Elekid, Miltank, Blissey, Raikou, Entei, Suicune, Larvitar, Pupitar, Tyranitar, Lugia, Ho-Oh, Celebi, Mudkip, Marshtomp, Swampert, Poochyena, Mightyena, Zigzagoon, Linoone, Lotad, Lombre, Ludicolo, Taillow, Swellow, Wingull, Pelipper, Ralts, Kirlia, Gardevoir, Surskit, Masquerain, Slakoth, Vigoroth, Slaking, Whismur, Loudred, Exploud, Makuhita, Hariyama, Azurill, Skitty, Delcatty, Sableye, Mawile, Aron, Lairon, Aggron, Meditite, Medicham, Electrike, Manectric, Plusle, Minun, Volbeat, Illumise, Gulpin, Swalot, Carvanha, Sharpedo, Wailmer, Wailord, Spoink, Grumpig, Spinda, Swablu, Altaria, Zangoose, Seviper, Lunatone, Barboach, Whiscash, Corphish, Crawdaunt, Baltoy, Claydol, Feebas, Milotic, Castform, Kecleon, Shuppet, Banette, Duskull, Dusclops, Chimecho, Absol, Snorunt, Glalie, Spheal, Sealeo, Walrein, Clamperl, Huntail, Gorebyss, Relicanth, Luvdisc, Bagon, Shelgon, Salamence, Metang, Metagross, Regice, Registeel, Latias, Latios, Kyogre, Rayquaza, Jirachi, Deoxys Normal