These are all the breeding groups as taken from Pokmon Crystal Version Perfect Guide.
Fariy: Pikachu, Raichu, Clefairy Clefable, Jigglypuff, Wigglytuff, Togetic, Hoppip, Skiploom, Jumpluff, Snubbull, Granbull, Marill, Azumarill, Chansey, Blissey
Flying: Pidgey, Pidgeotto, Pidgeot, Spearow, Fearow, Hoothoot, Noctowl, Zubat, Golbat, Crobat, Togetic, Farfetch'd, Natu, Xatu, Skarmoty, Doduo, Dodrio, Murkrow, Aerodactyl
Genfer Unknown:Magnemite, Magneton, Voltorb, Electrode, Saryu, Starmie, Porygon, Porygon2
Ground: Cyndauil, Quilava, Typlosion, Rattata, Raticate, Sentret, Furret, Pikachu, Raicu, Sandshrew, Sandslash, Ekans, Arbok, Dunsparse, Mareep, Flaafy, Ampharos, Wooper, Quagsire, Nidoran (M+F), Nidorino, Nidoking, Aipom, Snubbull, Granbull, Vulpix, Ninetails, Growlithe, Archanine, Stantler, Diglette, Dugtrio, Mankey, Primeape, Meowth, Persian, Psyduck, Golduck, Girafarig, Tauros, Miltank, Smeargle, Farfetch'd, Seel, Dewgong, Eevee, Vaporeon, Flareon, Jolteon, Espeon, Umbreon, Delibird, Swinub, Piloswine, Teddiursa, Ursaring, Phanpy, Donphan, Ponyta, Rapidash, Rhyhorn, Rhydon, Houndour, Houndoom, Sneasel
Humanshape: Drowzee, Hypno, Abra, Kadabra, Alakazam, Machop, Machoke, Machamp, Hitmonlee, Hitmonchan, Hitmontop, Magmar, Jynx, Electrabuzz, Mr Mime
Bug: Caterpie, Metapod, Butterfree, Weedle, Kakuna, Bedrill, Layba, Ledian, Spinarak, Ariados, Paras, Parasect, Pineco, Forretress, Yanma, Venonat, Venomoth, Scyther, Scizor, Pinsir, Heracross, Schuckle, Gligar
Monster: Chicorita, Bayleef, Meganium, tOTODILE, cROCONAW, fERALIGATR, mAREEP, fLAAFY, aMPHAROS, dang cap lock, Slowpoke, Slowbro, Slowking, Nidoran (m+f), Nidorno, Nidoking, Lickitung, Cubone, Marowak, Kangaskhan, Rhyhorn, Rhydon, Lapras, Snorlax, Bulbasaur, Ivysaur, Venusar, Charmeleon, Charizard, Squirtle, Wartortle, Blastois, Lavitar, Pupitar, Tyranitar
Plant: Chikorita, Bayleef, Meganium, Bellsprout, Weepingbell, Victreebel, Hoppip, Skiploom, Jumpluff, Paras, Parasect, Oddish, Gloom, Vileplume, Bellossom, Sunkern, Sunflora, Exeggcute, Exeggutor, Tangela, Bulbasaur, Ivysaur, Venusar
There are 8 more types. I'll post the rest later
'You must be buggin...!'
Fariy: Pikachu, Raichu, Clefairy Clefable, Jigglypuff, Wigglytuff, Togetic, Hoppip, Skiploom, Jumpluff, Snubbull, Granbull, Marill, Azumarill, Chansey, Blissey
Flying: Pidgey, Pidgeotto, Pidgeot, Spearow, Fearow, Hoothoot, Noctowl, Zubat, Golbat, Crobat, Togetic, Farfetch'd, Natu, Xatu, Skarmoty, Doduo, Dodrio, Murkrow, Aerodactyl
Genfer Unknown:Magnemite, Magneton, Voltorb, Electrode, Saryu, Starmie, Porygon, Porygon2
Ground: Cyndauil, Quilava, Typlosion, Rattata, Raticate, Sentret, Furret, Pikachu, Raicu, Sandshrew, Sandslash, Ekans, Arbok, Dunsparse, Mareep, Flaafy, Ampharos, Wooper, Quagsire, Nidoran (M+F), Nidorino, Nidoking, Aipom, Snubbull, Granbull, Vulpix, Ninetails, Growlithe, Archanine, Stantler, Diglette, Dugtrio, Mankey, Primeape, Meowth, Persian, Psyduck, Golduck, Girafarig, Tauros, Miltank, Smeargle, Farfetch'd, Seel, Dewgong, Eevee, Vaporeon, Flareon, Jolteon, Espeon, Umbreon, Delibird, Swinub, Piloswine, Teddiursa, Ursaring, Phanpy, Donphan, Ponyta, Rapidash, Rhyhorn, Rhydon, Houndour, Houndoom, Sneasel
Humanshape: Drowzee, Hypno, Abra, Kadabra, Alakazam, Machop, Machoke, Machamp, Hitmonlee, Hitmonchan, Hitmontop, Magmar, Jynx, Electrabuzz, Mr Mime
Bug: Caterpie, Metapod, Butterfree, Weedle, Kakuna, Bedrill, Layba, Ledian, Spinarak, Ariados, Paras, Parasect, Pineco, Forretress, Yanma, Venonat, Venomoth, Scyther, Scizor, Pinsir, Heracross, Schuckle, Gligar
Monster: Chicorita, Bayleef, Meganium, tOTODILE, cROCONAW, fERALIGATR, mAREEP, fLAAFY, aMPHAROS, dang cap lock, Slowpoke, Slowbro, Slowking, Nidoran (m+f), Nidorno, Nidoking, Lickitung, Cubone, Marowak, Kangaskhan, Rhyhorn, Rhydon, Lapras, Snorlax, Bulbasaur, Ivysaur, Venusar, Charmeleon, Charizard, Squirtle, Wartortle, Blastois, Lavitar, Pupitar, Tyranitar
Plant: Chikorita, Bayleef, Meganium, Bellsprout, Weepingbell, Victreebel, Hoppip, Skiploom, Jumpluff, Paras, Parasect, Oddish, Gloom, Vileplume, Bellossom, Sunkern, Sunflora, Exeggcute, Exeggutor, Tangela, Bulbasaur, Ivysaur, Venusar
There are 8 more types. I'll post the rest later
'You must be buggin...!'