The phrase "sometimes confused as" is pretty subjective, because I can believe that any Pokemon is a pseudo-legendary, and then that Pokemon would become a semi-pseudo-legendary. However, I can list all the Pokemon that have similar evolution families.
Venusaur, Charizard, Blastoise, Butterfree, Beedrill, Pidgeot, Meganium, Typhlosion, Feraligatr, Ampharos, Jumpluff, Sceptile, Blaziken, Swampert, Beautifly, Dustox, Gardevoir, Slaking, Exploud, Aggron, Flygon, Walrein, Torterra, Infernape, Empoleon, Staraptor, Luxray, Serperior, Emboar, Samurott, Stoutland, Unfezant, Seismitoad, Scolipede, Krookodile, Gothitelle, Reuniclus, Vanilluxe, Klinklang, Haxorus, Chesnaught, Delphox, Greninja, Talonflame, Vivillon, Decidueye, Incineroar, Primarina, Toucannon, Solgaleo, Lunala