5th Gen Which is the best feature introduced in these games?

You can only pick one so pick wisely! Do you think it would have worked as well in the future games or did you just enjoy it as a Unova-only thing? :)

RE-USABLE TMS AHHHHHHHHHHHHHHHH

The reusable TMs, which were a major change the games needed. And yes, I was happy it carried over to future generations.

The Repel update that asks the player if they want to use another one.

I went back and played another older game after playing through the games and it was so weird to have to select Repel manually lol These games made so many simple things so easy that we take for granted now.