In Pokemon Legends: Z-A, players collect plenty of Mega Shards before the game clearly explains their purpose.
The game throws players into the story from the start, with a tutorial-like introduction in Lumiose City, guided by a rival character.
During this early-game period, players learn about Wild Zones and Battle Zones and encounter Mega Crystals, which can be shattered to obtain Mega Shards.
Mega Crystals are collections of Mega Energy, described as rock-like formations with pink shards.
Although Mega Crystals are plentiful and easy to spot, the true purpose of collecting Mega Shards isn't immediately clear.
Author's summary: Pokemon Legends Z-A's Mega Shards have unclear usage.