I'm gonna try making a moveset here.
Entrance: Spyro flies in, does a loop then lands, mimicking his usual level entrance from Spyro the Dragon.
Jab Combo: A basic headbutt, then a horn swipe to the side, followed by a tail swing and a horn strike upwards to launch. His melee combo in Legend of Spyro.
U-Tilt: A sweeping headbutt covering Spyro's front and top. This is the Horn Toss from Shadow Legacy.
S-Tilt: A strong jab forwards with his horns. This is the Horn Jab from Shadow Legacy.
D-Tilt: Sweeps low with his tail. This is the Tail Swipe from Shadow Legacy.
Dash Attack: A quick charge forward with his horns referencing Shadow Legacy's Horn Slide move.
U-Smash: Charges a ball of flame launched into the air in an arc. The longer the charge, the more distance the ball gets. The Fire Bomb from A Hero's Tail.
S-Smash: Charges a fireball that travels directly forwards. Charging affects the distance. His fire breath from Skylanders.
D-Smash: Leaps briefly into the air with a wind-box dragging inwards, then follows with a powerful Head Bash move on the ground.
N-Air: A circular spin with his horns referencing his Pole Spin in A Hero's Tail.
U-Air: A multi-hit drilling motion with his tail upwards. The Tail Thunder from Shadow Legacy.
F-Air: Swings downwards with his tail with a meteor effect on the tip. Shadow Legacy's Tail Hammer.
D-Air: Stops and spins in midair and drops down in a Head Bash.
B-Air: A quick turn in the air with a small fire breath behind him.
Ledge Attack: Pulls himself up and does a sideways attack with his wing.
N-Special: His standard fire breath. Weakens the longer the button is held.
U-Special: Briefly gains the Super Flight powerup and dashes in a chosen direction. Can be steered.
S-Special: Gains Supercharge and rushes forwards. Turning, jumping or shielding cancels the charge.
D-Special: Gains Ice Breath and blasts in front of him with ice, freezing opponents.
Pummel: Grabs the opponent in his mouth and pummels them with small bursts of flame.
All throws are simple tosses of his head followed by a gush of fire.
U-Taunt: Sparx flies around Spyro as he looks around.
S-Taunt: Stretches his front legs out in the cat-like pose he does in Reignited Trilogy.
D-Taunt: Turns to the camera and winks.
Spyro's dodges are the sideways roll from Spyro the Dragon.
Spyro's shielding is his Wing Shield from Enter the Dragonfly.
FINAL SMASH: Spyro gains Super Flame and fires multiple huge waves of fire.