In Pokmon GO, certain Pokmon require special Evolution Items in order to evolve. Trainers can obtain these Evolution Items from several sources.

To evolve a Pokemon in Pokemon GO, you will need Candy. Each Pokemon capable of evolving will have a set amount of Candy required to trigger the evolution.

How to get Shroodle and evolution Grafaiai in Pokémon Go, and though not in the game yet, a preview of shiny Shroodle.

To get Eldegoss in Pokémon Go, you must evolve Gossifleur with 50 Candy. With the variety of ways you can get Gossifleur during the event, sourcing Candy shouldn’t be huge issue.

If you missed the original Machop Community Day, you'll get another chance at this green Shiny in the next Community Day Classic event.