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.
In Japanese, phone numbers are sometimes given as mnemonics derived from alternate pronunciations of the digits - for example, one such mnemonic for 262816 might be furo ni hairō. One possible mnemonic for 758 is nagoya, from nanatsu go yattsu, and it is possible this was the reason the name was chosen.
It is unclear if this will affect the games in any way if a region with a Route 758 is ever released, which, following the current numbering system of (generation - 2)XX, would occur in Generation IX if the region it takes place in has 58 or more numbered routes. As the four regions so far with numbered routes have had no more than 34 (Hoenn with that number, while Kanto possesses 25 or 28, Johto has 17, and Sinnoh has 30), and the release of Generation IX is five generations ahead of the current (with the four so far having taken more than ten years to release), this does not appear to be an immediate problem.
