Here's my attempt at a moveset.
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Final Smash: Malicious Moonsault
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Up B: Throat Chop
A recovery move that acts as a command grab similar to Cap. Falcon's up B. The difference is that Incineroar throws the opponent downward and he does not kick back when he does.
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Down B: Darkest Lariat
Acts similar to a grounded link's up b. Has some invincibility frames and is a good get off me tool. Can be charged to increase power and rpm.
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Neutral B: Flamethrower
Unlike charizard or bowser's flamethower, this projectile will be a fast, powerful stream of fire. This move must be charged for 2-3 seconds before unleashing. It will deal multihit properties and has final strong hitbox. It travels the same distance of a pk fire and the hitboxes are active for 1-2 seconds.
Side B: Seismic Toss
Command grab and is basically a piledriver move like Bowser Bomb
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Taunt: Bulk Up
This move gives Incineroar a temporary buff (think of deep breathing). The startup for this move is 3 seconds and cannot be canceled. The buff lasts for 7 seconds and gives incineroar the following: 20% knockback/damage reduction, 20% damage increase. Chargeable specials can be charged 20% faster too.
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Fair: Cross Chop
Double slash attack with similar frame data to charizard's fair
Bair: Backfist
Does a quick spinning backfist with low endlag. Similar to ice climber's bair.
Nair: Twirl
Quickly twirls in the air in a fetal position
Dair: Body Slam
Does a quick twirl in the air and quickly slams down with his stomach
Uair: Slash
Slashes in a wide circular arc above similar to Ike's new uair. Not as disjointed, but faster startup.
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Fsmash: Throat Chop (punch variant)
Similar power and frame data to Ryu's Fsmash
Dsmash:
Similar to Bowser's new dsmash, slightly weaker and faster.
USmash:
Slashes high in the air with a small leap like megaman's utilt. Does the twirl as well.
Ftilt:
Quickly kicks forward like captain falcon's ftilt
Utilt:
Quickly punches both arms above his head as if doing a victory pose
Dtilt:
Sweeping leg kick like Ryu's dmash. Weaker and much less end endlag.
Jab: Fury Swipes
Simple 1-2-3 jab similar to Charizard's
Dthrow:
Suplex opponent to the ground but does not cause knockback (like Snake's dthrow)
Uthrow:
Like K Rool's Uthrow
Fthrow:
Similar to Kirby's fthrow
Bthrow:
Similar to Mario's back throw