2023 ยท A: You need to breed a Congle and a T-Rox together to have a chance of obtaining a Grumpyre. Q: What level do my monsters need to be to breed a Grumpyre? A: Your Congle and T-Rox both need to be at least level 4 before you can attempt to breed a Grumpyre. Q: How long does it take to breed a Grumpyre? A: The breeding time for a Grumpyre is 24 hours.