Heartstrings
Gym Leader Fantina
The only one who appeared in the anime was Drake.
Yep, And the only one from unova was caitlen. The writers obviously aren't big fans of the e4.
To be fair, Will and Karen never showed up in the anime either.
all the gym leaders, but not the e4. we even see the champions, but not the e4. i guess it isn't always something the writers think is absolutely necessary for the show.
I feel like Sinnoh was planning to have Ash win the league at one stage, which explains why they went into detail with the E4 and Champion League. They're not really that relevant in any other saga, since Ash will never win the league and challenge them anyway.