How many Pokemon were announced or leaked before S/M came out?

Question

I want to see how much was revealed compared to the amount of new Pokémon overall in the generation.

Comments

Well obviously the first-form starters, so that's 3. I don't know about any others

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iirc, the entire Pokedex was datamined from the demo a week before they came out, so all of them.

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I remember the middle starter evos and the starters, the legends, and Tapu koko

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i vividly remember alolan vulpix being leaked and the hype around that

Answer 1

66 New Pokémon and 14 Alolan forms were announced, out of the 80 new Pokémon and 18 Alolan forms in S/M.

The previous answers are fine but I asked the question to know how much of the Pokédex TPCI announced, and used the word "leak" to include stuff like CoroCoro. The Sun and Moon demo was something I hadn't thought of, and that demo was the cause of the full 'dex leaking unofficially, so my answer accounts for how many Pokémon were officially announced via the Pokémon YouTube channel and CoroCoro.

This is going by the news articles on the DB home page.

Answer 2

When the Pokemon Sun and Moon demo was released, dataminers found the coding for every single Pokemon in the games data, along with their shiny forms. Therefore, every single Pokemon was leaked before the entire game was out.

Answer 3

iirc, the entire Pokedex was datamined from the demo a week before they came out, so all of them.
commented 2 minutes ago by KRLW890

So apparently the whole Pokedex was datamined, and here is a source that supports it.

Hope this helps! :)

Comments

We don't need a source we all remember it

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I dont and clearly the asker didnt.

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Well, I was asking about Pokemon that were officially revealed. I know I mentioned "leaks" but I was mainly talking about minor leaks not full datamines (which honestly happen to most Nintendo games these days).
I just want to gauge how much of the game GameFreak "spoiled".