they fuse in episode 253 of dbz
thanks for the question
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Depend on which version of Goku you're speaking of: Goku SSJ1 vs Majin Vegeta: Majin Vegeta Goku SSJ2 vs Majin Vegeta: Equal Goku SSJ3 vs Majin Vegeta: Goku Goku SSJ4 vs Majin Vegeta: Goku
episode 213
on mega video episode 230
Majin Vegeta. Majin Vegeta vs SSJ Goku (Ascended) ended in a draw, therefor one can conclude that an SSJ2 Goku would beat Vegeta.
he turns ss2 when he fights majin vegeta