I will advise you to breed for a pure S Thor, unless the one you have now has the talent you want. I know it will be extremely rare but you never know when that 1-2 extra points in your attack/health points will come in handy! Do a number of team modes and you should be okay with the silver.
Good luck!
Quitted!
"The past is history, the future is a mystery and today is a gift."
I wanted S rhor but i got HP,MDeF,SPD S and rest are A+ but the talent was force-lll so i stoped breeding so i wont suggest u to spend the money unless u want other talent then do it , good luck