Type Changes
Kanto (Gen 1)
Ivysaur: Grass → Grass/Poison
Charizard: Fire/Flying → Fire/Dragon
Blastoise: Water → Water/Steel
Pidgey, Pidgeotto, Pidgeot: Normal/Flying → Electric/Flying
Spearow, Fearow: Normal/Flying → Dark/Flying
Arbok: Poison → Poison/Dragon
Ninetales: Fire → Fire/Psychic
Meowth, Persian: Normal → Normal/Dark
Psyduck, Golduck: Water → Water/Psychic
Farfetch’d: Normal/Flying → Fighting/Flying
Grimer, Muk: Poison → Poison/Dark
Kingler: Water → Water/Steel
Voltorb, Electrode: Electric → Electric/Steel
Lapras: Water/Ice → Water/Dragon
Aerodactyl: Rock/Flying → Rock/Dragon
Johto (Gen 2)
Bayleef, Meganium: Grass → Grass/Psychic
Croconaw, Feraligatr: Water → Water/Dark
Noctowl: Normal/Flying → Psychic/Flying
Ampharos: Electric → Electric/Dragon
Bonsly, Sudowoodo: Rock → Rock/Grass
Sunflora: Grass → Grass/Fire
Girafarig: Normal/Psychic → Psychic
Granbull: Normal → Normal/Fighting
Magcargo: Fire/Rock → Fire/Poison
Stantler: Normal → Normal/Grass
Hoenn (Gen 3)
Sceptile: Grass → Grass/Dragon
Masquerain: Bug/Flying → Bug/Water
Ninjask: Bug/Flying → Bug/Fighting
Volbeat: Bug → Bug/Electric
Illumise: Bug → Bug/Psychic
Spoink, Grumpig: Psychic → Psychic/Dark
Trapinch: Ground → Bug/Ground
Vibrava, Flygon: Ground/Dragon → Bug/Dragon
Seviper: Poison → Poison/Dark
Lunatone: Rock/Psychic → Rock/Ghost
Solrock: Rock/Psychic → Rock/Fire
Kecleon: Normal → Normal/Ghost
Shuppet, Banette: Ghost → Ghost/Dark
Tropius: Grass/Flying → Grass/Dragon
Chingling, Chimecho: Psychic → Psychic/Steel
Glalie: Ice → Ice/Rock
Huntail: Water → Water/Dark
Gorebyss: Water → Water/Psychic
Sinnoh (Gen 4)
Staraptor: Normal/Flying → Fighting/Flying
Luxio, Luxray: Electric → Electric/Dark
Rampardos: Rock → Rock/Dragon
Pachirisu: Electric → Electric/Psychic
Floatzel: Water → Water/Electric
Lopunny: Normal → Normal/Fighting
Hippopotas, Hippowdon: Ground → Ground/Electric
Carnivine: Grass → Grass/Poison
Electivire: Electric → Electric/Fighting
Magmortar: Fire → Fire/Steel
Dusknoir: Ghost → Ghost/Fighting
Unova (Gen 5)
Servine, Serperior: Grass → Grass/Electric
Pignite, Emboar: Fire/Fighting → Fire/Dark
Dewott, Samurott: Water → Water/Fighting
Watchog: Normal → Normal/Psychic
Pidove, Tranquill, Unfezant: Normal/Flying → Fighting/Flying
Cottonee, Whimsicott: Grass → Grass/Flying
Darmanitan: Fire → Fire/Fighting
Maractus: Grass → Grass/Water
Cofagrigus: Ghost → Ghost/Steel
Gothita, Gothorita, Gothitelle: Psychic → Psychic/Ghost
Sawsbuck: Normal/Grass → Fighting/Grass
Klink, Klang, Klinklang: Steel → Steel/Electric
Tynamo, Eelektrik, Eelektross: Electric → Electric/Water
Elgyem, Beheeyem: Psychic → Psychic/Steel
Beartic: Ice → Ice/Fighting
Cryogonal: Ice → Ice/Ghost
Accelgor: Bug → Bug/Dark
Druddigon: Dragon → Dragon/Rock
Bouffalant: Normal → Normal/Ground
Heatmor: Fire → Fire/Dragon