>>39558692A few examples from every generation:
Gen I: Almost everyone, but particularly: Venusaur, Charizard, Blastoise, Nidoking&Nidoqueen, Raichu line, Muk, Wheezing, Pinsir, Gyarados, Dragonair, Mewtwo
Gen II: Ariados, Igglybuff, Forretress line, Kingdra, Raikou, Entei, Suicune, Tyranitar line and Celebi
Gen III: Sceptile, Dustox and Cascoon, Exploud line, Aggron line, Lunatone, Solrock, Milotic line, Absol, Glalie line, Metagross line, Regi trio and Weather Trio
Gen IV: Spiritomb, Drapion, Yanmega, Rotom (original form), Giratina, Cresselia, Darkrai, Sharymin and Arceus
Gen V: unlike Gen I, only a handful of mon can be considered "monsters". There are no middle ground in Gen V. You're either a Pokemon or a digimon/furbait/waifubait ripoffs
Gigalith line, Excadrill line, Scolipede, Sigilyph, Garbodor line (yes, I'm not joking. They're hideous monster/abominations), Galvantula, Ferrothorn, Eelektross line, Chandelure line, Haxorus line, Volcarona line, Reshiram, Zekrom, Kyurem and Genesect
Gen VI: lol
Gen VII: LMAO