I have no idea how that hint relates. There are no Pokémon or e-Reader games which suit those letters.
It's not about that, Mop it up. I'll go ahead and share my theory I'm trying to get UncleBob to confirm. I'm too tired and am going to bed in a few minutes as I just got home. Consider myself out for this round (unless by tomorrow when I get to work you still haven't gotten it)
The hint was Pokemon Acropolis or whatever. You look on Wikipedia and the only thing that stands for is an expansion in the pokemon card game.
First conclusion I came to: Ah, the only pokemon card game is on the Game Boy Color. Therefore the system the games are on is the GBC. After following some leads there that turned to dead ends I returned to the article and read about that specific expansion. It used the e-reader cards.
Second conclusion I came to: Ah, the e-card reader was for the GBA. Therefore they must be GBA games. All I found were leads to dead ends.
Take that as you will and happy hunting to you all.