Gems

Description
Shards are an item dropped when defeating any kind of Pokemon. These typed shard can be invested into the Shards tab to increase type effectivity, and your damage output.

Helpful tips
The shard types reflect whatever type(s) the Pokemon defeated were. Defeating Pokemon in a Dungeon give you 3 Shards of whatever types the Pokemon was, however defeating the boss will give you 20 Shards. Pokemon in Gyms give you 5 shards each, and Wild Pokemon on Routes give you 1.

Optimal farming routes
Type. Route. Chance.

Normal 1 100% Fire 112 50% Water 19 100% Electric 110 25% Grass 15 44.4% Ice 217 44.4% Fighting 217 33.3% Poison 15 66.7% Ground 111 55.6% Flying 115 60% Psychic 211 25% Bug 30 50% Rock 214 23.5% Ghost 209 11.8% Dragon 45 8.3% Dark 101 33.3% Steel 113 33.3% Fairy 112 50%

Kanto Gyms
Pewter: 10 Rock 10 ground Cerulean: 10 water Vermilion: 15 electric Celadon: 15 grass 10 poison Fuchsia: 20 poison Saffron: 15 psychic 5 fairy 5 bug 5 poison Cinnibar: 20 fire Viridian: 25 ground 10 Rock 10 poison Lorelei: 20 water 20 ice 10 psychic Bruno: 10 ground 10 Rock 15 fighting Agatha: 25 poison 15 ghost 5 flying Lance: 20 Dragon 10 flying 5 water 5 Rock Blue: (changes based on starter) 5; normal, flying, water, psychic, grass, ground, Rock, fire