I've seen that exact information in the pokedex, but I'm still not seeing it in Hoenn Route 115. I went to the grass area and wandered around, but only found Swellows, Taillows and Wingulls. No Jigglypuffs. I'm wondering if it's a bug or if I'm doing something else wrong.
I looked it up and it's supposed to be in the grass on Route 115 in that patch where you have to swim to, but I've been wading through it for 2 hours and haven't seen it, even though it's supposed to be common...does it not spawn there in PokeMMO?