Togekiss

The move rebalance on July 9, 2019 gave Togekiss the much needed addition of Charm to its movepool, which allows it to finally have a double Fairy moveset. While this doesn't let Togekiss reach the DPS numbers that Dragon-types can, the benefit of having a double resistance (in PoGo there's no immunity) to Dragon-type attacks lets Togekiss become a very tanky option if needed. 

On defense, Togekiss is acceptably bulky, shuts down Machamp, and resists Dragon. It has just Metagross whom it really fears.

Best PvE Offensive Moveset

• Charm + Dazzling Gleam lets Togekiss do what it does best: Fairy type offense.

• Aura Sphere actually offers more DPS than STAB Dazzling Gleam. However, its use is limited to targets that take super effectively from both Fairy and Fighting, such as Dark-type bosses. Actual Fighting-type Pokemon outperform Togekiss at this role, however.

• Hidden Power can cover Fairy’s other type advantages if you luck into a good type.

• For Hidden Power types, Fighting and Bug hit Dark, while Ice and Dragon hit Dragon. However, Charm hits all of the same minus resistances from sub-types.

• Air Slash + Aerial Ace is workable, but Dazzling Gleam is superior vs. Fighting-types.

• Ancient Power, Psyshock, and Flamethrower have no role on offense.

Best PvE Defensive Moveset

• Charm has a huge base power and hits hard on defense against common Fighting and Dragon-type attackers. 

• Hidden Power is generally worthwhile for defense due to its unpredictable typing.

• For Hidden Power types, Fire, Ground, Dark, and Ghost can sting Metagross. Ground Hidden Power is favored as it covers Electric, Poison, Steel and Rock attackers.

• Air Slash is a solid defensive fast move, just worse than the alternative.

• Flamethrower provides good coverage against certain threats and also has the second earliest damage window. 

• Aura Sphere* is a bit of a side-grade to Flamethrower, having semi-similar coverage and a very early damage window.

• Aerial Ace and Psyshock have 3 bars, but their coverage is less valuable.

• Against those who don’t dodge, Dazzling Gleam is by far the strongest.

• Ancient Power is workable on defense, but it’s not notable.

Peck not only grants Togekiss immense energy generation, but good damage as well. Charm, a move Togekiss was notorious for for many years, pales in comparison to Peck's flexibility. Air Slash is simply worse than Peck. Hidden Power is bad.

Togekiss has an incredibly wide Charged Attack movepool, and many of them are viable coverage options. Aura Sphere, Togekiss's Community Day move, is a staple choice thanks to its cheap cost, high damage, and great offensive typing. Dazzling Gleam is a STAB option that can quickly eliminate Dragon-type opponents, and is a generally deadly nuke. Psyshock ruins Poison-type Pokemon that may otherwise wall Togekiss's moveset. Flamethrower further threatens certain Steel-type opponents that are not weak to Aura Sphere. Ancient Power specifically targets Fire/Flying Pokemon such as Talonflame or Ho-Oh. Don't use Aerial Ace; it's the only unviable option in Togekiss's movepool.