Peridot is so shocked by this accusation that she pops out of her dragon form, completely losing her focus on holding that shape.

"But-- There's no way that can be true! If it was, how could the Ringmaster have not known about it? And isn't the Phoenix a creature of fire? I thought the Red Beast was supposed to be centered around wood and rot or something!"

She's been to Alola. SHE KNOWS THAT'S NOT HOW TYPE MATCHUPS WORK.