Dr. Lavaさんのイラストまとめ

Early Dragonite:

Dragonite's Red & Green sprite is his earliest known design, pre-dating his official artwork. Dragonite's sprite shows a ridge running down his back -- but it was later revised out of his design.

1. Recreation by @RacieBeep
2. R&G sprites
3. Official artwork

Beta Dragonair:

Dragonair's Japanese name is Hakuryū, meaning "White Dragon." His name appears to be a reference to his original beta design -- back when he was white, rather than blue.

1. Beta sprite recreation by @RacieBeep
2. Beta sprite, final sprite
3. Final artwork

Lost Dratini:

Dratini's Red & Green sprite -- his earliest known design, pre-dating his artwork -- shows he originally had a segmented belly. His later Blue sprite used this design as well.

1. Sprite recreation by @RacieBeep
2. Red & Green, Blue sprites
3. R&G official artwork

Beta Quagsire:

In Gold & Silver's 1997 demo, Quagsire was originally an unevolved pure Water-type. But Quagsire ended up getting revised to Water/Ground, and given Wooper as a pre-evolution.

1. Demo sprite recreation by @RacieBeep
2. Demo sprite, final sprite
3. Final artwork

Lost Pokemon of the Day: Turban

First revealed when Gold & Silver's 1997 demo leaked in 2018, Turban was almost promoted to becoming its own Pokemon... rather than just the monster that chews on Slowbro's tail.

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Lost Pokemon of the Day: Gorochu

First revealed by Game Freak developers in a 2018 Japanese newspaper interview, Gorochu was planned for Gen 1 as Raichu's evolution, but was cut due to a lack of cartridge space.

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Spectrier:

Playing Crown Tundra today, I suddenly came across a new Legendary Pokemon called Spectrier. It's basically Beta Suicune, but it's a horse. https://t.co/h5oxr0erEh

Beta Suicune:

In Gold & Silver's 1997 demo, not only did Suicune have a radically different (and very emo) design, but it was simply named Sui -- which translates into English as "Water."

1. Demo sprite recreation by @RacieBeep
2. Demo sprite, final sprite
3. Final artwork

Lost Pokemon of the Day: Beta Squids

First discovered when Gen 1 beta assets leaked in 2019, these two Beta Pokemon were created during Red & Green's development... but they didn't end up making Gen 1's final cut.

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Lost Corn Pokemon?

Muneo Saitō, the designer who created Gen 2's Legendary Beasts, published these monster designs in 2014. Saitō said they were created for a video game, but got scrapped during development. Unfortunately, he didn't specify whether or not that game was Pokemon.