R.O.B. has very good moves both on ground and in the air. All his tilts are very fast moves with less knockback that should be used to push back and pressurize an opponent. The down tilt also has a chance to trip the opponent which is somewhat useful. His down smash is amazing and is always good to use, his forward smash is very strong, and he also has a strong up smash with somewhat limited range.
In the air, R.O.B can either approach with his forward air which is a very fast aerial with considerable knockback, or try to K.O. with harder to hit but more rewarding neutral and back aerials. The back aerial will be especially hard to hit with since it is a rocket move and it doesn't hit a wide area, but the neutral air hits all around him and sends the opponent far. His down aerial is also spike which is useful because R.O.B. can easily make it back to the stage after using it, as with any of his aerials.
(3%, 3% total of 6%) R.O.B. punches twice if you press it twice. This move is a good way to deal of a quick first-hit (if that's what you're in too.) and can be used to hit foe away from you so you can use a different attack.
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Robot Fist
(3%) Punches with one arm. Can be angled. This is a move you shouldn't use so often but can come in handy when the time is right.
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Robot Push
(9%)R.O.B. volleys upwards. This move is good for good amounts of combos and very good for aerial juggling. You should spam this move as if you use it to frequently, the opponent will know when you will use it and adjust to your playing style and do an aerial dodge. Though use it for juggling and quick ways to get foe a higher damage.
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Low Push
(5%)Pushes arms at the ground. This move is one that you shouldn't use very often unless absolutely necessary. The reasoning is because when your foe starts edgeguarding this is one of the only moves to use specifically. Also note, that this move could causes opponent to trip for about 3 seconds and this lets you charge up a different attack.
while dashing
while dashing
while dashing
while dashing
Robot Thrust
(5%)Thrusts his arm forward. Other then a good way to start the match for a first hit, you shouldn't use this TOO often.
(16% if uncharged, 12% if at the tip uncharged, 19% if fully charged, 18%if fully charged tip)Fires a short-ranged laser burst in front of him. This moves is at a medium-high in all his moves. This move can be used as foe is falling down after uses their UP-B move, when they are stuck in Gulpin Pokemon or dirt etc. The knockback is alright and can potentially KO if opponent is at 80% or higher depending on the stage.
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(Smash +) or
(Smash +) or
Exhaust Burst
Fires a flame above him. Powerful, but doesn't hit ground enemies sometimes.
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(Smash +) or
(Smash +) or
Arm Spin
Spins his arms near the ground. Hits multiple times, last hit knocks enemy away.
Fires a more powerful shot when at full charge. Charges on its own. You can tell how charged it is by the diode on ROB's head, which is brighter after charging. Can pass through multiple characters, and aimed with the control stick.
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Arm Rotor
If used properly it can deflect projectiles. Can be angled upwards or downwards by moving left or right.
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Robo Burner
Same as Pit's Up-B but it uses a rocket engine to go up instead. Requires recharging after fuel depletes. Recharges by staying on solid ground for 1.5 seconds. You cannot airdodge during this move, so be careful.
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Gyro
Chargable projectile. Can be picked up after it is launched, but it spins, usually dealing damage to those who touch it, even after it lands.
Diffusion Beam: R.O.B. fires a continuous beam from its eyes. Great for knocking an opponent off and guarding the edge. The cool thing about this move is that R.O.B. can use his other moves (besides Robo Beam) at the same time. So you can pull off some awesome combos with Gyros and Grabs. This Final Smash is not forever however so KO the enemies fast.
There's also a glitch where rob can jump into the bridge of eldin when it's broken and right as the bridge is forming, with good timing, you can use his Final smash FOREVER!