HM06 Rock Smash in FireRed.

Rock Smash. An HM can be taught to any number of Pokemon and the move cannot be forgotten without the Move Deleter. 208 species in Pokemon FireRed can learn it.

Bulbasaur, Ivysaur, Venusaur, Charmander, Charmeleon, Charizard, Squirtle, Wartortle, Blastoise, Beedrill, Rattata, Raticate, Pikachu, Raichu, Sandshrew, Sandslash, Nidoran (female), Nidorina, Nidoqueen, Nidoran (male), Nidorino, Nidoking, Paras, Parasect, Diglett, Dugtrio, Psyduck, Golduck, Mankey, Primeape, Growlithe, Arcanine, Poliwhirl, Poliwrath, Machop, Machoke, Machamp, Geodude, Graveler, Golem, Slowbro, Muk, Gengar, Onix, Krabby, Kingler, Cubone, Marowak, Hitmonlee, Hitmonchan, Lickitung, Rhyhorn, Rhydon, Chansey, Tangela, Kangaskhan, Scyther, Electabuzz, Magmar, Pinsir, Tauros, Gyarados, Lapras, Omanyte, Omastar, Kabuto, Kabutops, Aerodactyl, Articuno, Zapdos, Moltres, Dragonite, Mewtwo, Mew, Bayleef, Meganium, Quilava, Typhlosion, Croconaw, Feraligatr, Furret, Togepi, Togetic, Flaaffy, Ampharos, Marill, Azumarill, Sudowoodo, Politoed, Aipom, Wooper, Quagsire, Slowking, Girafarig, Pineco, Forretress, Dunsparce, Gligar, Steelix, Snubbull, Granbull, Scizor, Shuckle, Heracross, Sneasel, Teddiursa, Ursaring, Slugma, Magcargo, Swinub, Piloswine, Corsola, Skarmory, Houndour, Houndoom, Phanpy, Donphan, Tyrogue, Hitmontop, Elekid, Magby, Miltank, Blissey, Raikou, Entei, Suicune, Larvitar, Pupitar, Tyranitar, Lugia, Ho-Oh, Treecko, Grovyle, Sceptile, Torchic, Combusken, Blaziken, Mudkip, Marshtomp, Swampert, Poochyena, Mightyena, Zigzagoon, Linoone, Lombre, Ludicolo, Seedot, Nuzleaf, Shiftry, Breloom, Slakoth, Vigoroth, Slaking, Loudred, Exploud, Makuhita, Hariyama, Nosepass, Delcatty, Sableye, Mawile, Aron, Lairon, Aggron, Meditite, Medicham, Gulpin, Swalot, Sharpedo, Wailmer, Wailord, Numel, Camerupt, Torkoal, Spinda, Trapinch, Vibrava, Flygon, Altaria, Zangoose, Seviper, Whiscash, Corphish, Crawdaunt, Claydol, Cradily, Anorith, Armaldo, Kecleon, Dusclops, Tropius, Absol, Spheal, Sealeo, Walrein, Relicanth, Bagon, Shelgon, Salamence, Metang, Metagross, Regirock, Regice, Registeel, Kyogre, Groudon, Rayquaza, Deoxys Normal