Transparent Language Presentation?

Another game series that I play has gradually featured the development of a fictional language that is a key part of the historical background of the series. The characters who are involved are understood to possess comprehension of the language, though in the game and related media, they are presented as speaking in English (or whatever language is opted, if localization is available). It is apparent that Pokémon isn't as such, as all the human characters speak plain language... or do they? This possibility might still deserve to be considered.

Likewise as in the other game series, the human characters speak the language of the respective localization, whether the Japanese original or English plus others elsewhere. Yet this may not be able to hide the fact that they may be speaking a different (hitherto unknown) language in the background. This is what I call a "transparent presentation" of language, in that the background language is presented through another language as a proxy, in this case the languages of the localizations. I've also mentioned this in my old post about Pikachu speaking.

One thing that may support this "transparent presentation" is the glyphs that are present in the anime adaptation, which are somehow recognizable for understanding, in contrast to Unown glyphs that look strange. In this case, it may then be regarded that the glyphs constitute the language that is being "transparently presented" by proxy of Japanese, English, or whatever language is the localization of choice. Though the background language would still be unknown unless elucidated, and that may not matter much.

Something that might disprove this "transparent presentation" theory is that the world of Pokémon is likened to an alternative history of the Earth, where the creatures of Pokémon develop instead of the animals of the world as is known today. On the other hand, there is a small part of this conjecture that may also allow for alternative languages to develop instead of modern languages, and therefore it would also partially support the theory as above instead of fully disproving it.

The theory of a background language that is "transparently presented" through various real languages and media forms of Pokémon may be interesting even if there is no conclusive evidence that it does constitute the reality of the world of Pokémon. That reality is more focused on the creatures that the human characters pit against one another. Even so, the human characters still need to comprehend one another to do exactly that, and if not through a real language, the background language may just be the answer.

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