Learn or Forget?

[Skystrike]

100% yes.

Roar of Time

 

[Adam Levine]

I'll pass, even if the name does sound cool.

Night Daze?

 

[Resolve]

Forget. Assuming I'm using Zoroark, Night Daze would give me away immediately. (it's a slightly inferior version of dark pulse, in most cases)

Judgment?

 

[Skystrike]

Generally, yes. Great way to have a move to take advantage of Arceus's type changing gimmick.

Aeroblast?

 

[Sheep]

Learn, one of the coolest moves in the game.

Sky Attack?

 

[EmTheGhost]

Forget; pretty much no one would ever use this move without a Power Herb, and there's not much reason to go to all that effort when alternatives like Acrobatics and Brave Bird exist. Also, I think 90 accuracy is a bit low for a charge-up move. Just outranked in a lot of areas.

Magnitude

 

[Adam Levine]

2 random 4 me, forget

Sketch.

 

[Hyzenthlay]

Learn, where would Smeargle be without it?

Water Shuriken?

 

[PageEmp]

Forget.

Scald

 

[Adam Levine]

Learn.

Scary Face?

 

[Resolve]

Forget.

Thunder Wave?

 

[Hyzenthlay]

Learn, great in general but especially for catching Pokémon!

Sing?

 

[Zeostar]

Learn, but for the same reason being it's mostly good for catching things.

Will-O-Wisp

 

[Resolve]

Learn.

Facade?

 

[Janp]

Learn! It can be great on some Pok?mon.

Pound?

 

[Zeostar]

Forget

Stomping Tantrum

 

[strangerhypno]

Forget. Earthquake is cooler.

Growl

 

[Janp]

Forget. No one has time to drop opponent's stats.

Tailwind?

 

[Skystrike]

Yes, making your whole team faster (in most cases it's enough to make your team go before your opponents) is very useful.

Swords Dance?

 

[Hyzenthlay]

Very useful for many Pok?mon, so learn!

Mud Bomb?