I wrote this script that adds a Pokedex chapter at the end of the PTOoS epub and then links Pokemon names from within the chapters to the Pokedex. The script downloads the pictures and descriptions of the Pokemon from Bulbapedia.
It solves the issues that a) I only know the Pokemon from the first two generations and b) I only know the German names from when I played the games as a child. On my e-book reader, I can quickly click at the link to remind myself how a specific Pokemon looks like and then use the back-button to continue reading immediately.
If you enjoyed Pokemon as a child and consider yourself a rationalist, I recommend checking out Pokemon: The Origin of the Species.