New myvi advance comes with 15inch rims so I think upsize to 16inch make sense.

To TS, to answer your question yes you can swap to 16inch rims. A few considerations to note

1. Look for the tyre size you want to swap. From tire calculator, the most suitable size is 195/45R16 as it has the least radius differences compare to original tyre. So you have to find out is this size easily available and what brand/model available in the market. Of course you can opt for other size but then the difference will be bigger and it will impact your odometer, FC, etc. try to keep as close as possible to the original radius.

2. The weight of the new rims + tyre should not differ much from the original rims + tyre. This means maybe you need to opt for original japan rims instead of Taiwan copy. Again, matching closely to manufacture spec is the best.

3. Myvi adv comes with ASA. From my reading, you’ll need to resend your car back to Perodua for recalibration. Please check with your nearest Perodua centers.

4. Swapping to lower profile tyre (55 to 45) will definitely have impact on comfort. Don’t expect the same comfort as original specs.

In summary, you’ll want to keep the spec as close as original from Perodua as that is the most optimized for your car (comfort, FC, power). A lot of time people just swap without these considerations and then complain the car is not comfortable, no power, FC increase, etc. of course it will as the car are optimize for the original spec, not to the upgrade being done by user. So there will always have drawbacks whether its comfort, power or FC. It’s you to decide which one you can live without.  Anyway I’m a myvi g3 advance user as well, please share your findings in case in the future I decided to upgrade the wheels as well 😁😅