Pikachu duplication glitch
I had just started the game my starter (mudkip) was level 14, I was fighting the magma grunt with a level 20 pikachu and I had to use beldum (level 13) to stall him out and I had stalled him for a very long time after my beldum died I finished off the pika chu with an aqua jet from mudkip. After the pikachu died the trainer kept sending in pikachus and I kept getting the exp from the pikachus this kept going untill the game crashed.