Upon collecting the Eevee from Bill, I have decided to evolve it into Jolteon for two reasons: first because I have never trained a joltoen and have barely ever even owned one and second because it would be my only electric type at the moment other than my flaaffy.
So I came here to check the HHSS location of the thunderstone and notice it says:
"National Park (come in 1st in the bug catching contest)".
This is incorrect, the sun stone is the first place prize in the bug catching contest, as it was back in the originals. I couldn't possibly be mistaking the 3 sun stones in my bag at the moment each of which I was given upon winning the bug catching contest.
Just thought I'd point this out.