Zamazenta - Hero of Many Battles

Poor Zamazenta - Hero of Many Battles enters the raid meta as yet another misbegotten mess of a Legendary Pokemon as far as the PvE meta is concerned. Its stat-line isn't made for raids, its moveset is bad, and it really doesn't even have much hope for the future at all. It may be a hero, but it's definitely not the raid-hero that we're looking for.

It's wort noting that Zamazenta has a Steel Type Signature Move named Behemoth Bash, but only its Crowned forme can learn it. Even more reason that this poor pup is in the raiding doghouse.  

Best PvE Offensive Moveset

• Snarl offers the highest general energy generation, and can pair with Crunch for a Dark Type moveset, but the lack of STAB hurts its utility.
• Metal Claw pairs with Iron Head to make Zamazenta into a Steel Type attacker, but only its Crowned forme gets Steel Type STAB.
• Quick Attack is an okay choice if Snarl's typing clashes with the Charged Move of choice for a given raid.
• Ice Fang is slow and doesn't offer much type-synergy. Though it can pair with Moonblast to make a... very bad Dragon Type couner.
• Close Combat is the Charged Move of choice for its STAB, though it's a weaker move in general and tends to have its effectiveness profile clash with Snarl.
• Moonblast is a weak option for Zamazenta.

Ice Fang is what truly separates Zamazenta from Zacian, and is thus picked over Quick Attack, Snarl, and Metal Claw as a result. Its strong offensive profile, excellent damage, and decent energy generation makes it worth running.

Close Combat is the only Fighting-type Charge Move available, and benefits from STAB to threaten significant damage. Crunch is recommended due to its lesser energy cost, and coverage against Zamazenta's weakness to Psychic-types and struggles vs Ghost-types. The 30% chance to proc its debuff isn't very consistent, but can flip certain matchups if the dice rolls in your favor. Moonblast is a strong move, but lacks STAB and costs quite a lot of energy to access. Iron Head can be used as a surprise coverage move to hit Fairy-type Pokemon super effectively, but is generally not as valuable as Crunch.