Meloetta (Aria Forme)

Meloetta Aria Forme is an interesting addition to Pokemon Go. With Mewtwo being the strongest Psychic-type Pokemon since....forever, and arguably the best for the foreseeable future (and probably forever), any new Psychic-types added to the game are ultimately dealt the unfortunate hand of living in Mewtwo's shadow. That doesn't make Melotta bad or useless; it's still a solid Pokemon in the PvE scene if you're tired of seeing and maybe using teams of Mewtwo (and only Mewtwo). As a Mythical Pokemon however, the real challenge is the significantly more tedious task of obtaining Candy XL. 

Best PvE Offensive Moveset

• Confusion is better for offensive use, and benefits from STAB.
• Quick Attack isn't a bad move, but can't be Super Effective against anything.
• Psyshock suits Meloetta's role as a Psychic-type attacker.
• Hyper Beam is the strongest Charge Move option, but lacks a Super Effective modifier. 
• Dazzling Gleam falls behind without STAB.
• Thunderbolt has no use here. 

Following the September 2022 update, Quick Attack is Meloetta's preferred Fast Attack due to its solid energy gain. However, it does cannot hit anything super effectively. Confusion offers strong damage output with average energy gains, but is doubly resisted by Dark-type Pokemon.

Psyshock costs the least amount of energy, benefits from STAB, and is a decent well-rounded move. Dazzling Gleam costs a lot of energy, but provides coverage against Meloetta's weakness to Dark-type Pokemon. Thunderbolt can help Meloetta bypass certain Steel-, Water-, and Flying-type Pokemon. Hyper Beam demands too much energy to use, but its raw damage can be a devastating surprise.