Ash's eye color changed. Like in the Anime recently it changed. I think in Sinnoh or Unova as I watched a few minutes and turned it off as it sucked and actually tried it. Still sucked. Oh well.
[insert really long rant here about Ash's eye color change here]
But srsly why the eye color change?
Desert and Shadow. The Desert has really mind bending puzzles. They don't involve to much combat( bar Arbiter grounds sometimes) but break your skull open because of puzzles. And Shadow because, well, come on.
Fire. Come on.