>Pokemon R/B
>Articuno, Zapdos, Moltres, Mewtwo
>Pokemon G/S
>Raikou, Entei, Suicune, Ho-Oh, Lugia
>Pokemon R/S
>Kyogre/Groudon, Regirock, Regice, Registeel, Latios/Latias, Rayquaza
>Pokemon D/P
>Dialga/Palkia, Uxie, Azel, Mespirit, Heatran, Cresselia, Giratina
>Pokemon B/W
>Reshiram/Zekrom, Cobalion, Terrakion, Virizion, Landorus, Tornadus, Thundurus, Kyurem
>Pokemon X/Y
>Xerneas/Yveltal, Zygarde, Mewtwo, Zapdos, Articuno, Moltres
>Pokemon S/M
>Solgaleo/Lunala, Tapu Koko, Tapu Bulu, Tapu Lele, Tapu Fini, Zygarde, Necrozma

These were all of the legendary Pokemon available in the base games of each generation at no extra cost. Meanwhile, in SwSh we have

>Zacian/Zamezenta, Eternatus
Then an extra $30 for extra legendary hunts. Even XY, the games that are notorious for being barebones had more stuff to do than SwSh do.