>>723757526
The anime and Masters EX having voice acting means they can't really pull a gibberish language off.
It's not unusual for games to only have English and Japanese dubs, but TPCi would probably push for more languages, possibly every supported language option.

Game Freak incidentally are backed into supporting a minimum number of languages, due to how your language choice determines the "country of origin" for your Pokémon, which factors into trading, breeding compatibility, and shiny chances ("Masuda Method").