You can revisit any stage in the game once beaten, as you already likely know. This is a great way to seek out a full gauge on any stage you hadn't yet achieved on one. What's more, any emblem you've managed to unlock (there are three on each stage) will remain unlocked, as long as you successfully get through the stage. However, you must build the meter up from scratch if you want to unlock any emblem you've yet to get on any stage, regardless if one or two are already unlocked.