Pokemon Diamond glitched?

For some reason pkmn trainer sheryl keeps popping up whenever i encounter a wild pokemon and then it becomes a 2vs2 battle between me and sheryl vs 2 wild pokemons... Is there a way to fix this? Sheryl helps me "fight" my battles whenever its 2v2 battle between trainers also. And she's annoying me with her chansey. . .

Why dont you try taking her to the end of the forest?

Yeah, it's part of the storyline. She helps you through the forest and heals your Pokemon after each battle. Once you exit the forest she will go away, and you can go back to the forest on your own.
No glitch here.

lol