As usual, I don;t got the experience, but let's see what I could think of based on the 2 characters.
What kind of team is Zelda + Pit?
This would seem to be more Defensive than Offensive, Pit himself is already more defensive than offensive (depending on the Pit's style), and Zelda would seem defensive a bit, too, with her reflector and projectile.
The team would be more Passive, but may lean to Semi-Passive/Semi-Aggressive too. Just remember that both of them have projectiles and reflectors.
What roles two the two have in the team?
The basic thing to consider in 2v2 battles is what role every character has. Possible roles could for example be:
* Finisher: Zelda can KO faster which would make her the better finisher, but Pit is great at Edgeguarding, and gimping about half the roster. Pit can be classified here if the opponents are off stage.
* Damage racker: Pit would be classified here with his multi-hit attacks and pretty decent attack speed. Pit can rack up damage while Zelda can keep some of her KO moves fresh.
* Supporter: Both characters can fit here at times.
-Pit already has one of the better projectiles in the game, and being able to control the projectile can help Pit support Zelda whenever Zelda is in close-combat.
-Zelda can support with some Din's Fire at long range. As long as the Pit is aware of the Din's fire, and at the same time, pressure his opponent in close-combat, Zelda should be able to strike the opponents from long range without hurting Pit.
* Stock holder: Pit would have to fit here, for not only is he a bit heavier, but he also has a much better recovery. He's also superb at Ledgecamping, simply a good amount of Defensive needs.
* Spacing master: A Pit that spaces with F-airs and shoots arrows would win here. Actually, idk how Zelda can space, since I haven't used her in a long time.
* Multitasker: Pit has an okay offense, weakened by his bad melee range, but has a better defense. His capability of good support from a long distance and good edgeguarding also make him a good multitasker.
Zelda would be the better KOing character, better range, and some okay defense of her own.
This division is not to be taken too strictly as it´s not unusual for the characters to have traits from multiple of these playstyles, but they work as a nice directory.
What can the two do to support each other?
I need to see a decent Zelda matchup chart, and I should be able to provide more inpit in this area.
What problems does the team have?
Well, I can't say much here, yet without the Zelda matchup thread information, but I would think that the team would have Marth Problems. Pit already has a disadvantage against him, and they probably would be outranged by Marth, and broken MK, with some other moves as well. I believe Zelda hates G&W like Pit does.
Again, I can't say much. without some Zelda matchup data.
Is there something special that should be noted about the team?
Pit and Zelda would make a pretty nice Edgeguarding team, with Zelda's fireballs and Pit's arrows out there. I still can't say much here. I just need more Zelda info.
1.3 Ending words
I can't give a rating yet without some Zelda matchup data, and I can probably sum up most of it later on with that data.
Just give me that Zelda matchup thing, and I'll be able to provide more stuff.
And before I forget, keep in mind that Pit will have problems with MK, G&W, Marth, Wario, Kirby, Olimar, and a bit of Falco, TL, and ROB.
EDIT: I will either edit this post or make a newly updated one after I get a viewing of the Zelda matchup thing, and other stuff.