Pit has the bow, arm, and orbitars used so...
I think Pittoo should use his staff, palm, cannon, and bow. I don't know about the Ogre Club since the Ore Club is featured.
My ideas for his specials:
Up Special:
1. Violet Palms. Basically a shoryuken move to be simple.
2. If EZ Cannon, then a rocket jump. Why? Why not?
3. Power of Flight. Yay, vanilla option...
Side Special:
1. Silver Bow. If you played Uprising then you know you can dodge and shoot at the same time. So, this is what Pittoo will do, he'll dive and shoot a couple of arrows.
2. Violet Palms. I don't know about this; I never played Uprising, but I seen a playthrough of it and I don't recall palms being used much.
3. Ogre Club. Swing it, slam it, whatever.
Neutral Special:
1. Dark Pit Staff. Functionally, it'd work like Falco's Blaster that travels far, but like Pit's Palutena's Arrow, you can aim it.
2. EZ Cannon. Now you can aim it unlike the Down Special idea! Whoopie!
3. Silver Bow. Yay, more vanilla options...
Down Special:
1. EZ Cannon. I don't know what to say besides Pittoo will just shoot it.
2. Ogre Club: One, he can do something similar to King Dedede and Kirby or he could just slam it down instead of swinging it.
3. Violet Palms. A move similar to Lucario's Down Smash where Lucario hits both sides, but the Palms augment the range and basically gives Pittoo a good defense option, but only for his sides.
Final Smash:
1. Sniper. Basically a copy of Snake's and SSB4 Zero Suit Samus's Final Smashes. It makes sense since he does snipe you in Uprising.
2. Power of Flight. Basically, he'd go Charizard X, Super Sonic, or Super Dragon Yoshi on you.
3. Pit Two. This might be weird, especially with another Pit player, but he could do a tag-team attack.
4. Doom Cannon. Similar to Samus's Zero Laser, but with DOOM!
5. Dark Pit Staff. Yay... More vanilla options.
Wow, what a wasted character... I doubt people would be that mad at Pittoo if he wasn't a clone. Same with Lucina except she gets the benefit of not looking like her "original".