What are all of the Pokemon that have different forms?

I know that Arceus, Deoxys, Shaymin, Giratina, Rotom, Shellos, Gastrodon, Pikachu (the different ones in costumes), Gyarados, Meloetta, Kyurem, Keldeo, Genesect, Furfrou, Hoopa, Tornadus, Thundurus, Landorus, Scatterbug, Spewpa, Vivillon, Darmanitan, Greninja, Pyroar, Meowstic, Minior, Aegislash, Pumpkaboo, Floette, Minior, Wishiwashi, Lycanroc, Solgaleo, and Lunala have different forms, but can someone tell me what all of the Pokemon that have different forms are? Please include regional variants, changes in appearance during moves, fused Pokemon, Pokemon that change forms when holding or using items, gender variants, and anything else that I forgot.

-Thanks

Pleaselog inorregisterto add a comment.

This list ignores shininess and doesn’t include gender differences if the only difference between the genders is their interactions with infatuation or captivate.Mega evolutions: Venusaur, Charizard, Blastoise, Alakazam, Gengar, Kangaskhan, Pinsir, Gyarados, Aerodactyl, Mewtwo, Ampharos, Scizor, Heracross, Houndoom, Tyranitar, Blaziken, Gardevoir, Mawile, Aggron, Medicham, Manectric, Banette, Absol, Garchomp, Lucario, Abomasnow, Beedrill, Pidgeot, Slowbro, Steelix, Sceptile, Swampert, Sableye, Sharpedo, Camerupt, Altaria, Glalie, Salamence, Metagross, Latias, Latios, Rayquaza, Loppuny, Gallade, Audino, DianciesourceAlolan Forms: Rattata, Raticate, Raichu, Sandshrew, Sandslash, Vulpix, Ninetales, Diglett, Dugtrio, Meowth, Persian, Geodude, Graveler, Golem, Grimer, Muk, Exeggutor, MarowaksourceCaused by abilities in-battle: Castform, Cherrim, Darmanitan, Greninja, Aegislash, Zygarde, Wishiwashi, Minior, MimikyuCaused by items: Groudon, Kyogre, Giratina, Arceus, Genesect, SilvallyCaused by moves: Keldeo, MeloettaCaused by evolution conditions: Wormadam, LycanrocChangeable outside of battle: Pikachu, Deoxys, Rotom, Shaymin, Tornadus, Thundurus, Landorus, Kyurem, Hoopa, OricorioDetermined upon encounter and unchangeable: Pikachu, Basculin, Floette, Meowstic, Pumpkaboo, Gorgeist, ZygardeCompletely aesthetic: Pichu, Unown, Burmy, Shellos, Gastrodon, Deerling, Sawsbuck, Vivillon, Flabebe, Floette, Florges, Furfrou, Xerneas, Minior, Solgaleo, Lunalasource