It has been repeated many times before, but I'll do it again. For Shantae's moveset, it can go like this. (You can change it if you want)
Ground
Standard A: Hair whip where it is spamable like Megaman's pellets with little flinching.
Forward A: using the roundhouse kick technique
Down A: crouch and hair whip
Up A: using the boot equipment to kick up overhead.
Dash attack: using the cuff equipemt to perform a charge attack like Wario's shoulder bash.
Aerials
Nair: Tiara equipment where shantae spins in the air
Uair: overhead kick with the boot equipment
Fair: forward two leg kick like King K Rool
Bair: using one leg for kicking like Sonic would
Dair: Sash equipment where Shantae drill down or diagonally down. Maybe act like corrin's Dair.
Smash attacks
Forward: more powered up version of the roundhouse kick technique
Up: powered up version of the boots equipment and can launch shantae upward if held down
Down: from SSBC, summon 2 storm puffs on each side to crash lighting down
Specials
Neutral: transform into four animals based on input. Press again to transform back. It can't be done immediately and will leave you vulnerable for the first moments after morphing
Forward: fire spells. Tapping will shoot one fireball. Holding will make a flamethrower
Down: pike ball and it's level depends on how long. Their duration may last for 5 secs like Megaman's leaf blade, but cannot be launched
Tapping: 1 pike ball
Some time held: super pike ball
Full charge: scimitars
Up: using risky boots cannon to go up three times. After that, duds once all three cannonballs are used.
Animal Transformations Pros and Cons
Monkey (Right): Small, fast with the monkey claw for damage build. Easier to launch with more receiving damage
Elephant (Left): Heavy, powerful and can use the Elephant charge and stomp to launch players. Jumping is very low with slower movement.
Harpy (Up): Can allow shantae 4 more jumps and can fire with Harpy Talons. Easier to launch and has a hard time with stop traction like Luigi.
Spider (Down): shoot poison from a distance for overtime damage and pressure. Slow attack speed.
Idle animations
1. Correcting her hair
2. Looking around and rest a bit before back alert
3. Dances for a moment
Taunts
1. Item get
2. Dance command as a nod to the original shantae game
3. Drinking a potion (not to heal like how young link drinks lon lon milk)
Victory Animations
1.
2.
3.
Idk at this point, but here is my updated thoughts on her moveset.
Edit: her dodge animation is the backdash technique. Though, her spotdodge could be smash original.