Dr. Lavaさんのイラストまとめ

Beta Ampharos:

In Gold & Silver's 1997 demo, Ampharos was originally much shorter and fatter, compared to how he appeared in 1999’s final artwork -- and his stripes were different as well.

1. Demo sprite recreation by @RacieBeep
2. G&S 1997 demo sprite
3. 1999's final design

Beta Mareep:

In Gold & Silver's 1997 demo, Mareep was originally pink. He was later changed to yellow for G&S's release version, but pink was repurposed as his Shiny color.

1. Demo sprite recreation by @RacieBeep
2. 1997 demo sprite, 1999 release sprites
3. 1999's final design

(3/4) Manboo evolved into Ikari at level 19, who evolved into Gurotesu at level 38.

Ikari's design was likely revised into Sharpedo, while Gurotesu probably ended up as Lanturn. Gen 3's Huntail also appears to have scavenged elements from Gurotesu's scrapped design.

Lost Pokemon of the Day: the Ikari family

First revealed when Gold & Silver's 1997 demo leaked in 2018, this three-stage Water/Steel family was created for Gen 2, but tragically, didn't make Johto's final cut.

(Photo descriptions & more info continued in thread below) (1/4)

Beta Tangrowth:

In Gold & Silver's 1997 demo, Tangela had an evolution named Jaranra. He was cut from Gen 2, but he finally returned in Gen 4 -- but with a new name and a new design.

1. Demo sprite recreation by @RacieBeep
2. 1997 demo sprite, 2006 final sprite
3. Final design

(2/4) Details about White Pichu were first revealed by Shōko Nakagawa in her 2013 autobiography. Shōko is best known as the host of Pokemon Sunday, and she's also Spiky-eared Pichu's voice actress in the Japanese anime. Shōko's even revealed White Pichu's official concept art.

Lost Pokemon of the Day: White Pichu

Spiky-eared Pichu was a special event Pokemon introduced in Gen 4. But originally, Game Freak was planning for a White Pichu to occupy this role... but sadly, White Pichu ended up getting scrapped.

(More info continued in thread below) (1/4)

Beta Mantine:

Mantine's typing of Water & Flying makes a lot more sense once you've seen his original design from Gold & Silver's 1997 demo -- which btw, was named Haneei, "Winged Stingray."

1. Demo sprite recreation by @RacieBeep
2. 1997 demo sprites
3. 1999 release sprites

Lost Pokemon of the Day: Petilil evolution

First revealed in a 2011 Ken Sugimori interview, the Petilil family was originally designed with 3 stages -- but one stage was cut because Gen 5 had too many Grass types.

(Photo descriptions & more info continued in thread below) (1/4)

Beta Ledyba:

In Gold & Silver's 1997 demo, Ledyba and Ledian weren't linked by evolution data. It seems they were originally rivals -- but later, were revised into relatives.

1. Demo sprite recreation by @RacieBeep
2. 1997 demo sprite, 1999 final sprite
3. 1999's final design