My name in-game is Wolfram and my rival is Rubidus. All my pokés, just as well, are named after chemical elements.
The main character is Tungsten and the rival is after Rubidium, mainly becauuse he's really reactive like the alkali metal and wears red. Rubidus is greek for red, as far as I know.
Then again, I might restart the whole game just to name the rival Caesius, since he's even more reactive and has blue hair. That and I dislike Rubidus in anything not named Darmanitan.