Route 215 have been thought to have glitches in the Japanese version, some people claim having a Manaphy egg that just 'popped up' in their party, when they had Phione in their team
so Phione + rainy route = does mean something.
But meh, who knows
But Ivysau in route 215, that's really weird.
More and more weirder things are happening in route 215!