Glaceo

It turns out that in hoen to go to the moon and beat deoxys then they sent me to the last gym of hoen and there I could have access to the last medal, I won in that gym and supposedly they gave me the medal but I do not appear to have it nor is it registered as such and to that city once you leave it you can not re-enter at that moment, I am unable to have the last medal and without being able to enter the Víctory road. Help please