I was thinking I could play Doubles at Montenevera, but I can’t seem to start a battle at the battle field, so I’m out of ideas. I really wanted to see how the Dondozo-Tatsugiri animations would look like.
In the hidden treasure of area zero part 2 (indigo disk), most (I think all) battles are double battles. There are many videos on youtube of this animation. Also (if you had not done it yet), at the end of the story, you get to rematch all the gym leaders including Ryme.