free to be the greatest
I hate to be the bearer of bad news, but the codes do indeed expire.Do Wonder Card serial codes have expiry dates? I have a Regigigas/Heatran code for SM/USUM from last year and I'm wondering if it still works. (I can't test it myself because I only have a digital copy of Moon and I'd like to save the code for a physical copy)
The NA codes for Regigigas and Heatran expired June 28th last year.