NORMAL MODE - Sasori uses the Sandaime Kazekage puppet, which was hailed as Sunagakure's most powerful ninja.
Sasori's main battle-style, long-range combat. However, note that if either Sasori or the puppet is hit, the ENTIRE attack string is cancelled, most especially for the Satetsu attacks. Be warned. Further, the Satetsu Shigure attacks do NOT go upward. They only go horizontally forward, or vertically downward, or an angle combination of the two.
A, A, (UP) + A = Puppet: Sword Attack - Sandaime Kazekage pulls out a buzzsaw, then fires out needles, then slashes the enemy with a sword. The hitbox is massive; very excellent for defending.
A, A, (FWD) + A = Puppet: Thousand Arms Technique - The same buzzsaw and needle followed by long puppet arms stretching horizontally. Does glorious damage, but comes out really slow.
A, A, (DOWN) + A = Puppet: Kunai Gun - Buzzsaw, needles, followed by the classic kunai spam. IT EVEN AUTOTRACKS FROM BEHIND. Highly recommended for general combat.
A, A, (BACK) + A = Puppet: Poison Mist - Buzzsaw, needles, then Sandaime Kazekage pops up smoke. But wait, that smoke is POISON and, once connected to the enemy successfully, drains the HP out of your enemy until they die. Obviously his top-tier combo.
(UP) + A = (DOWN) + A = Iron Sand: Cluster Attack; Giant Hammer - Sasori uses Sandaime Kazekage puppet to materialize a massive prism of Iron Sand above the enemy. Once it solidifies, Sasori sends it crashing on the opponent. Does RIDICULOUS amounts of damage. However, the materialization time for the prism is quite long, and the block itself is easy to dodge. The attack CANNOT be blocked (seriously, do you expect to tank something like this?).
(BACK) + A = (FWD) + A = Iron Sand: Cluster Attack; Giant Spear - Sasori uses Sandaime Kazekage puppet this time to materialize a massive pyramid of Iron Sand. Once it solidifies, Sasori sends it to the opponent, trying to tear the enemy apart. Although it doesn't do as much damage as the Hammer version, the Spear version is almost impossible to evade once it solidifies. The attack cannot be blocked as well.
(BACK) + (BACK) = Puppet Pull - Pulls out the Sandaime Kazekage. Very useful most especially when the enemy got past the puppet's attacks.
B = (UP) + B = Iron Sand: Scattered Showers - Sasori's kunai attack, he uses Sandaime Kazekage to spam multiple shards of Iron Sand and sends it all to the opponent. The attack begs more accuracy, but since it is a spammed attack, it is impossible to evade fully.
C = Kawarimi - Do I (still) have to answer?
(DOWN) + C = Forced Kawarimi - Forces the Kawarimi technique for you to end up behind the opponent. This is practically useless with default Sasori (since all of his attacks come from his puppet).
*hold* X + (DIRBUTTON) = Control - Obviously, controls the puppet.
*hold* Y = Chakra Charge - Charges Chakra.
*hold* S = Iron Sand Shield - Sasori's taunt generates a makeshift shield out of Iron Sand, causing projectiles to be blocked. The more chakra invested to it, the longer the shield can hold.
Added (2012-07-17, 9:41 PM)
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SPECIALS
Y + A = (UP) + Y + A = Iron Sand: Scattered Showers Combo - The same Satetsu Shigure attack, but this time, much deadlier. Sasori now uses the amplifier stored in the Kazekage's chest, causing the attacks to go exponentially faster. (-1000)
Y + Y + *hold* A = Iron Sand: Unleash - Sasori's ultimate attack. After modelling chakra intensively, Sasori manipulates two Iron Sand masses and crashes them together. Since these blocks have the same polarity, it results into a massive magnetic explosion causing the Iron Sand to "explode" in every sense and word. Does catastrophic amounts of damage. (-2000)
*hold* Y, 40% HP left = Awakening: Hitokugutsu Mode - Sasori shows his true form, a puppet with a stinger, arm blades, and flamethrowers. And oh, reassembling body.
AWAKENING MODE - Sasori unleashes his true form! This time Sasori goes full melee, equipped with high damage combos and fast attacks.
A, A, A = Puppet: Scorpion - Sasori uses his stomach stinger to stab the enemy, pulls himself forward while activating the arm blades thus slashing the enemy, then flies upward while spinning. Does great damage. You can also continue the attack string with Sasori's air combo for even greater lethality.
(UP) + A, A = Puppet: Spin - Sasori spins toward his opponent, then does aerial backflips slashing the opponent further. Sends the enemy flying.
(DOWN) + A, A = Puppet: Fireflower - Sasori uses his arm blades to slash the opponent, then uses his flamethrowers to incinerate the slashed soul. Does guard breaking.
B = (UP) + B = Fire Burst - Sasori fires.. well, fireballs. The ground version is aimed, while the aerial version goes down in a 45 degree constant angle.
C = Kawarimi - Do I (still) have to answer?
(DOWN) + C = Forced Kawarimi - Forces the Kawarimi technique for you to end up behind the opponent. Very effective especially when used in combination with the fireflower.
*hold* Y = Chakra Charge - Charges Chakra.
X = Enters Akahigi mode
Y + A = Fire Cannon - Sends out a MASSIVE wave of fire at your opponent! Incinerates them badly. However, the attack is blockable (though impossible to dodge). (-1000)
AKAHIGI: HYAKKI NO SOUEN (SECRET RED MOVE: PERFORMANCE OF A HUNDRED PUPPETS) - Sasori goes back to his main battle-style, however... this thing is pure evil. PUPPETS EVERYWHERE! You can use ALL 5 performances AT ONCE. On top of that, you can even use his Fire Cannon jutsu while all the puppets are active. Talk about real spam. Ouch! Be warned though, the puppets die in one hit. Like it matters though, you can just spam more e.e Note, all of them are fairly easy to dodge.. alone. But what if they're all spammed at the same time?
A = Puppet Performance: Battle - Sasori summons a squadron of puppets to tear the living crap out of the enemy. They're very easy to kill though.
(FWD) + A = Puppet Performance: Rush - Sasori summons squadrons of puppets over his head, then sends them flying towards you. Fairly easy to dodge.
(UP) + A = Puppet Performance: Dance - Sasori summons multiple puppets on the ground, then after a while, they will start ascending while slashing the crap out of the enemy. Sends the enemy flying upward.
(BACK) + A = Puppet Performance: Storm - Sasori apparently uses a satellite bombardment mechanism that fires puppets from the heavens. They crash aimlessly everywhere. The massive speed of the puppets make the attack unblockable.
(DOWN) + A = Puppet Performance: Crash - Sasori summons squadrons of puppets, this time, over the ENEMY's head. He sends the puppets then crashing at the opponent.
Y + A = Fire Cannon - Similar to his mobile Hitokugutsu mode.
B = Dual Fire Burst - Same to his mobile form, but this time he uses two arms.