Summary of the cut gen 7 Pokemon. These were taken from SM design docs scattered about.
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The area the player was supposed to access the fossils in was cut from the game, it ended up being that pikachu trailer park only available in Ultra games. Note that there is supposed to be a cave/grotto past the water, likely where player was supposed to swim to retrieve the fossils, and that the means to revive the fossils are on the exact same island.
That Munchlax is pretty damning, there is no reason for it to be there and it always stuck out to me. Ditto for Ribombee and Bruxish being so weak, makes sense if they were not originally their final forms. I am guessing that A-Seel was either an early version of Popplio or cut when it became redundant. Same goes for A-Rhyhorn, as even back in Gen 1 these two were pretty much the same.
The real robbery was the Fairy Type Scyther, I love the base variant and I already hate how much superior Scizor is. It's interesting that Turtonator was supposed to get pre-evos as well, that implies that it was either going to be available much earlier or that each version would have a unique Dragon to it's name, one having Kommo-o and the other having Turtonator.