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So Ho-oh upgraded the eeveelutions into the Johto beasts...
Well Lugia did the same thing for the Kanto birds.
You can easily see how the general body shape is preserved, especially with the beaks.
Also:
Pidgeot's flowing hair => Arcticuno's flowing tail
Dodrio and Moltres have thin necks, ball heads, and long legs.
Furthermore, the Dex order correlates perfectly.
18, 22, 85
144, 145, 146
>B-but Farfetch'd-
Dux was originally supposed to evolve into Doduo. There were 3 bird families and 3 Legends.