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A legendary should have the following qualities:
>Look ancient/old enough so that people can have learned about it and formed stories around it
>Look like either a powerful animal or some kind of local spirit, the kind that could be interpreted as lesser gods by primitive people
>Not be literal pokegods on the scale of Zeus or Yahweh
Therefore,
>Good Legendaries: Birds, Beasts, Lugia, Ho-Oh, Golems, Lake Spirits, Cresselia, Genies, Reshiram/Zekrom/Kyurem, Xerneus and Yvaltel, Necrozma
>Bad Legendaries: Lati@s, Weather Trio, Dimensional Duo, Arceus, Solgeao and Lunala, Musketeers
