Trouble defeating Grand Champion help

I have a time strike team but the grand champion I still too hard to beat, what do I do?

Use Rhynobrawl and Puffoxin, at the start of the fight and just use Death Roulette a until you have a big number advantage. It’ll likely take a few tries due to being luck based but it works!

Killed him with a bloodcrave team and I had like 5 monsters left.