Best way to get Game Chips if you don't have any is solving
Hangman.
You'll unlock more when your Trainerlevel is higher Or just spend PD on it but don't-
Don't mind me, just floating around here and there, once in
a while :3
You can buy (I think) 500 Game Chips with PD. After that, you
can only buy them again with PD if you drop below 500 GC.
Useful is the Golden Slot Center, you get the Golden Game Chips
from interacting, and it can reward a lot of stuff, including
regular GC