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Some other anon noticed various traits of legendaries lined up with their respective gen.
>Gen 1
Mew the original legendary
>Gen 2
Lugia/Ho-oh Duality
>Gen 3
Weather Trio (Kyogre, Groudon, Rayquaza)
>Gen 4
4 states of Matter, or legendaries of creation
Solid = Dialga
Liquid = Palkia
Gas = Giratina
Plasma = Arceus
>Gen 5
V for Victini. V is the Roman numeral for 5.
>Gen 6
Hexagon patterns on Zygarde
>Gen 7
Necrozma can split light into the seven major colors. ROYGBIV
