if you have paused it for long periods of time or if you pause it alot it will slow down the aging process
and changing the time won't do anything since the character has to be a teen for i believe 48 hours so if you change the time it's still going to wait the 48 hours to evolve
If it wont evolve i suggest that you dont pause it and dont reset it because doing those things can also do some weird things to ur tamagotchi so i reccomend that you put it to sleep for like about 2 days and the wake it up so it can evolve(btw it grows in its sleep so dont worry)Dont forget to put the lights out . Hope that helped
Dont worry it will wear off when you got to sleep and btw the costume (rare) wears out when you got to sleep except you can wear it as many times as you want! Hope that helped
The last code you enter at the shop will give you the costume!