Gems

Description
Shards are an item dropped when defeating any kind of Pokémon once the player has the Shard Case unlocked. These typed shards can be invested into the Shards tab to increase type effectivity, and your damage output.

Helpful tips
The shards you get from defeating a Pokémon depend on the type(s) that Pokémon has. Wild Pokémon on routes give 1 shard per type, dungeon encounters give 3, gym/trainer Pokémon give 5, and dungeon bosses give 20.

Type effectiveness chart
Type and shard effectiveness