You should have expo cli Download expo cli
then should clone the project.
npm i https://github.com/berkaynayman/pokemon-app.git
then should download dependecies the project.
npm install
then should run project.
npm start
then you see like that results.
now you open the smart phone and download Expo Go App. Expo Go APP Download
then open the Expo Go App and click the Scan QR code and read the QR code on CMD from Smart Phone.