Route 758
From Bulbapedia, the community-driven Pokémon encyclopedia.
Route 758 is the location that PokéPark took place in, in Nagoya, Japan.
There was a contest to name the street PokéPark was to be built in to give it a location in the Pokémon game world. There were 2,203 entrants, and "Route 758" was the winner.
It is unclear if this will have any affect on the games if it eventually does reach 758 Routes. It will be a long time before the Pokémon games even reach that point, if ever.