The new Mega Pokemon appearing in the Pokemon GO Mega Raid is Mega Latias. Defeating it is the only way to get Shiny Latias. The shiny odds are 1/20, so you need luck and patience to find the Shiny variant.
You need to grind in the game to earn a Shiny encounter, which is only possible when you win Mega Latias Raids. If you aren’t lucky, you’ll have to win many raids to get a chance of encountering a Shiny Latias.
Mega Latias is a dual Dragon and Psychic-type Pokemon. Its weaknesses include Bug, Dark, Dragon, Fairy, Ghost, and Ice. Its resistances are Electric, Fighting, Fire, Grass, Psychic, and Water.
You need good counters to defeat Mega Latias and trigger its shiny encounter in the game. Focus on creating a battle team that revolves around its weaknesses and avoid using attacks it resists.
Use counters that Mega Latias is vulnerable to in Pokemon GO. The list includes Mega Rayquaza, Mega Garchomp, Shadow Tyranitar, Mega Gardevoir, Primal Groudon, Mega Latios, Mega Gyarados, Mega Salamance, Zarude, and Dialga.
After you catch a Shiny Latias in Pokemon GO, use its Mega Energy to evolve it into a Shiny Mega Latias. Remember, you cannot get a Shiny Mega Latias by beating it in its raid. You can only find its regular and shiny form.
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