Similar to that of Rocky 3 when Rocky and Apollo Creed decided to train together in preparation for Clubber Lang after they fought as rivals. What fighters have actually worked together in the same training camp where one fighter brings along another fighter that they either lost or beaten and hires him as their head trainer? Micky Ward training Arturo Gatti for Carlos Baldomir is one example.
Most recently Malik Scott started training Deontay Wilder a few years after he got KO’d (or perhaps took a dive) by Wilder in one round.