So, in Gauntlet Mode, I was going through with my 5 pokemon, and for some reason, not one of the trainers stopped me on my way to James. I just walked all the way to him and began the battle (which i nearly won, I might add, Garchomp had about 10 HP). In fact, as I'm typing this, the glitch has happened again. All the way to James without a single battle. The pokemon I'm using, in order, are Absol, Glaceon, Magnezone, Volbeat, and Mismagius. I'm not sure what could be causing this glitch, but considering that it has happened twice in a row, it might be an issue, as it cheats the Gauntlet Mode and allows for the player to take their time battling James. If you need any more information, let me know.

And I just took complete advantage of it. Ah well, I wasn't going to use Latias anyway.

happened to me too lol

It seems the reasoning for this is that the game believes those trainers have already been defeated. Upon trying to force a battle by interacting with them, they merely said "I've lost..." or some variation of such. The Gauntlet Mode is what I consider the most reliable way to level up your pokemon in preparation for the Final Cave, so to see that it's broken in such a way is pretty disappointing. Please figure out the issue and solve it, Savordez!