

Sakurai: I'm sorry, Jigglypuff.
Clearly, Jigglypuff is the single most likely character to get cut from Smash 6. JP has no canon feats or relevance, is constantly at the top of class in weakness, and only barely avoided getting cut from each sequel repeatedly. And demand for Tails and Krystal to both be playable is far greater nowadays, so they are both worth cutting Jigglypuff for!
The movie involving Krystal that we need
Note: The Shadow Hunters from Mega Man Xtreme (and its remake Mega Man DXtreme) replace Jack and Jill. And Tails is too powerful for The Last Wish, so the sequel has to be Two Tails and Forty Thieves instead.
A Mega Man X SNES style life bar I made for Krystal
A Mega Man Zero style life bar I made for Krystal
Krystal needs this intro when Smash 6 promotes her to playable (read description)
Like Patrick ripping off his two suits, except Krystal shows up in her Command outfit, rips it off to reveal her Assault outfit underneath, rips the Assault outfit off to reveal her tribal outfit underneath, and fights in the tribal outfit.
My completed Jewelpet style Krystal sprite sheet
Krystal: My Little Pony transformation and move set
Pony Krystal Moves by SPAT23 -- Fur Affinity [dot] net
Transform
Jab
Psychokinesis
One-legged Kick
Donkey Shrek 2 GBA Kick
Spin Dash
Ground Quake
Curled up into a ball
Air Axe Kick
Handstand Kick
Shrek 2 GBA Donkey Horizontal Spin Kick
Krystal 1-Up Icon sprite I made
I used the second image, my sprite sheet of Larimar from Jewelpet, as a base.
Krystal Wario Land TF Sheet by SPAT23
Cave Story: Krystal's Path by LuckyFoxy
Play the game here: Cave Story: Krystal's Path by LuckyFoxy
Jewelpet and Star Fox clothing swap
Fay and Krystal are wearing the human form outfits of Sapphie and Larimar respectively. Larimar technically gained clothing since she normally wears even less than Krystal's tribal outfit: Just a snowflake pendant, tail beads, and a tail flower.