It wasn't really mentioned anywhere, but it turns out that the pokédex entries from the first two stadium titles (Pocket Monster Stadium and the internationaly-released Pokémon Stadium) are identical. What's more is that the english translation is very accurate.
I wasn't able to find the japanese listed anywhere, so extracted it here:


Pokémon Stadium 2 has both Gold and Silver's pokédex entries embedded, but not Crystal. Also, even non-japanese copies have all the text and menus for Battle Stadium, although without a sample saved battle that probably couldn't be restored.