[This is sort of a What If. Celeron didn't died against Raditz, by extension didn't went to King Kai, so all he had was False Super Saiyan in a fight against Cooler, which he acquired during Demon King Piccolo's Saga.]
Cooler: Just give it up, Saiyan. You can't win against me.
Celeron: Tch... *rips off his top gi as his power rises* I won't let you destroy my world!
Cooler: Try all you want. You are only delaying the inevitable.
Celeron: *his skin turns golden, eyes become fully white and his hair rises upwards* HAAAAAAAAAAA!!!!
Cooler: Hmm? (Isn't this... the Legendary Super Saiyan? Impossible...)
Theme
Spark of Super Saiyan Power
[hope ya enjoy lol]