a84be234_ty_driven_Pokémon_encyclopedia__Cause
[Glitch Trainer] Glitch Trainer with Pokémon over level 100 of any species, sometimes even ?????. The game may also suddenly display "Waiting..." as if it was in a link battle. Once this message is displayed, the game will freeze. [Cause] 
Obtained through a corrupted link battle or Mystery Gift
Trainer House glitches - Bulbapedia, the community-driven Pokémon encyclopedia