Shop

The last icon on your toolbar is the Shop. The Pokemon Market and Gear Market can be found here. Recycle Pokemon and Gear to collect shards.

Pokemon Market
The most efficient thing you can do with those extra low level Pokemon you have is recycle them in the Pokemon Market. With the Pet Coins you receive after recycling can buy shards of other types of Pokemon, including legendaries. Upgrade Orbs and Evolution Stones are also available for purchase.

You can hold 5 free refresh attempts at a time, and your total remaining chances for the day depend on your VIP level. Gain another refresh attempt every 30 minutes.

Gear Market
Three tabs exist in the Gear Market, along with the Obtain button used to recycle old gear.

Enhance Gear is the first tab. These items can be bought an unlimited amount of time and can be unlocked by completing the necessary boss level.

The Legendary Gear tab is self explanatory. You can buy Primal Shards here, and eventually obtain Primal Gear.

The last tab has items for purchase only once.