The references to real-world locations (in the games) doesn't end with Mew's Pokedex entry.
Lt. Surge is "The Lightning American" who served in "the war" (probably Vietnam, but it could be argued that it was Korea, WWII, or the first Gulf War, depending on your view of the sliding time scale).
Arcanine's Pokedex refers directly to "China" in Yellow and Stadium I. Later Pokedexes refer to "Chinese Pokemon" or "legendary Chinese Pokemon." Also, the short speech one of the trainers in the Battle Tower gives references China.
There's probably a handful of other examples too.
Now, that being said, just because a fictional universe is inspired by something that happens to exist in the real-world doesn't connect the two. That's fairly common. Artists and writers take what they know and make tributes to it. For example, just because the main Pokemon regions are based on areas in Japan does not mean the Pokemon world takes place in Japan. But simply it's design is inspired by Japan.
I personally think it's similar to our Earth, as far as land mass location. There's obviously a huge difference in areas such as technology (Pokecenters everywhere but very few cars or big cities, etc...).