What is the Speak Poké Names game, how does it work?

According to the introduction of stefsquared, Speak Poké Names is a Casual game on the Android platform. There is currently a 1.02 version released on Oct 29, 2017, you can see the details below.

This unofficial app will speak and display the names of all the Pokémon available in Pokémon GO in 6 languages :-
English
French
German
Italian
Japanese
Spanish

2 languages are displayed so the names can be seen in your native language and a foreign language.

Selecting a name will speak it in the chosen language.
Selecting a language allows it to be changed.

Sorting by name or Pokedex number.

Version 1.22
Added all missing entries