[Loli]

If it's an online game where you can play with other users you won't be able to do this.
The values and account data will be stored server side.

Sort of true. If it's purely online, then it's 100% stored server side. However if it has an offline mode, you can edit the values on Android with GameGuardian, in most scenarios you want a realistic edit, not like 9999999. They'll just revert it back to what it was when they check in with the server side data. But, if it's something realistic then you can expect it to be saved server side, and remain on your account.

Though now-a-days it seems all games need a internet connection, which is quite lame.