You're missing some mechanic from X/Y.
Pokemon can now inherit egg moves from either parent. That means a female panpour can be hatched with hydro pump, then you can use that panpour to breed another panpour (this time with a sylveon carrying disarming voice as the father) and hey presto. You have both. This isn't applicable here yet though as gen 6 egg moves haven't been implemented into the game yet right? Meaning disarming voice would be impossible.
If Simipour was a defensive pokemon I'd agree with you on scald vs hydro pump, but as far as I know it isn't. Therefore I'd recommend hydro pump.