I do hope they'd take care to archive it somewhere accessible, yet that has not been pillaged in the last decade.

[Cecil has long stopped trusting the security at the Elite Four mansion.]

We might also want to ask Pokémon for their point of view. Plenty might have been inherited from long gone trainers, with memories from those years. And it's likely that certain Legendaries such as Arceus would know even more, as they watch over us to some degree.