Pyrowolf is a Ben 10 Ultimate Team Tennyson. He was regained by Shape Shifter's Pyrowolf. He is a mix of Heatblast and Benwolf. He has Fire Sonic Howls. He is useless, because he has Heatblast,Swampfire, Ult Swapfire and Ultimate Goop to shoot Fire, and Benwolf and Echo Echo with sonic blasts.
It turns out that Pyrowolf was made of radation, which caused the Omnitrix to go into Radation Mode.