Basically, all attacks involving the tail act like Marth's sword, the tip always has extra damage and knockback, but it has to be sweet-spotted.
Up Tilt- Attacks with wings simultaneously above him. Same knockback and damage as Fox's u-tilt in Brawl/Project M.
Down Tilt- Ridley swipes his tail in front of him. Has a sweet spot with more damage and knockback at the end of the tail, due to the spike. Like how Charizard's d-tilt worked in Brawl, only Ridley uses his tail.
Side Smash- Ridley dashes forward, attacking with his claw. A bit faster than Bowser's (In Brawl), a bit slower than Kirby's. Decent power, and a bit of more range than Bowser's.
Up Smash- Ridley soars into a flip. Slower, but a bit more powerful than Fox's in Brawl.
Down Smash- Ridley spins around, attacking with his tail on both sides. Like a mix of ROB's and DDD's d-smashes in Brawl, same execution speed as Fox's, and a few multi-hits like ROB's. Though not as many hits as ROB does.
Neutral Air- Spins in a fast, multi-hitting ball.
Forward Air- Ridley Flips, and slams the opponent with his tail. This is a Meteor Smash.
Backward Air- Ridley swipes his tail back quickly. Good for a Wall of Pain. Tip of the tail has a sweet spot for added damage and knockback.
Up Air- Ridley stabs his tail upwards. This is good for juggling.
Down Air- Sticks tail right beneath him to stab. If he hits the ground while doing this (not the enemy), he bounces.
Overall, he has pretty good buffs here to make him high tier. Now to give him a few nerfs so that noobs won't use him all the time. So that he's high tier when used by people who use the appropriate techniques.
Nerfs:
Pretty much a bit lighter than Mario, and a fast fall speed between Fox's and Wolf's in Brawl. Faster than Fox's, slower than Wolf's. So that he can have not both an easier time to combo, but in a sense, he'll be easier to be chain grabbed and combo'd a bit too. It also nerfs the ease of his recovery a bit like it does to both Fox and Wolf. (Again, an easier time recovering than Wolf, harder time than Fox, mid air jumps-wise.)