Manny Pacquiao now has a UFC veteran helping him train ahead of his mega fight against Floyd Mayweather Jr. Pacquiao's trainer Freddie Roach has enlisted ex- UFC fighter Dashon Johnson as the eight-division champions sparring partner as he readies himself for his May 2nd showdown with Mayweather. The 5-foot-9 Johnson has an 0-2 record in the UFC.