route 10 reset and missing stone

i can fight most of the trainers there again and again without having the number of them
aswell i get some items which are found on the ground more than one time ( and i dont mean the berries ) .
at the river with the fishermen ( he say " oh , i hope those wild fish pokemon dont bite me . ... ) is a gap between the stone on the bottom side .... i can swim there behind the trees on top of the mountain to the end of the map.

I also have the thing where the items and some trainers reset, (I've gotten 4 or 5 hyper potions by now - not that I'm complaining) and I haven't found that missing stone, but there is one on route 8 after the 2nd power plant that allows you to access part of a now blank route 8, (Not too much of a problem but I thought I'd mention it)