All the sprite are licenced and created by these author with free assets pack and/or with paid assets.

V2 Credits 

3200 Minerals & Gemstone Icons Vol. 1: https://ateliermagicae.itch.io/100-free-minerals-gemstones-icons

Crafting Material Icons Vol.2: https://ateliermagicae.itch.io/crafting-material-icons-vol2

Pixellab (pouch sprite generation): https://www.pixellab.ai/

V1 Credits

Badges sprites (Free Pixel Gemstones!) : https://tmatdev.itch.io/gems

Gym badges pouch (Travellers pouch by BigWander): https://bigwander.itch.io/travellers-pouch