Pokemon Go Beldum Community Day Classic guide
Briefly

During the Beldum Community Day on Aug. 18, trainers can enjoy a high spawn rate of Beldum with an increased shiny rate of approximately 1 in 24.
Players should evolve Metang into Metagross between 2 p.m. and 7 p.m. local time to ensure it learns the powerful charged move, Meteor Mash.
Even if you can't evolve during the event timeframe, there's a chance to evolve later in December's Community Day or by using an Elite TM.
Metagross remains a top-tier steel-type Pokémon with its ideal moveset being Bullet Punch and Meteor Mash, excelling against several types of opponents.
Read at Polygon
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