1. First of all, the computer joystick in the fourth Dojo of Poké mon Sword Shield needs to talk to Ge Lao. Ge Lao will check your whole body and go to the Taoist temple to find a pot. Take this pot to the tea ceremony hall to collect purple, platinum, cyan and four-color tea.

2. Secondly, go to the tea ceremony hall to find a teacher to learn tea ceremony, prepare tea and give it to Ge Lao.

Finally, Ge Lao gives you a simple rocker, which can be turned by pressing it on the computer.