Just confirmed on retail carts, both of these changes are to create a straight path for egg hatching.
>>51856203RS: There's a flower girl who wanders into your path on the beach, also no cave for Groudon
Emerald: Flower girl moved a few tiles south and is replaced with a young boy, flower girl now cannot wander into your path in time to interrupt your biking
>>51856231RS: The straight bike path collides with the fenced flower garden
Emerald: Fenced flower garden raised one tile allowing you to bike freely following the path
This is not an uninteresting version change and you should feel new for thinking so