In around episodes 140-145 in Dragon Ball in the Tenkaichi Budokai (A.K.A: World Tournament)
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In the last dragonball episode.
in dragonball episode 6 or 7
they get married on the last episode of dragon ball when goku has to save chi-chi's father from burning in the flaming castle episode 153
The episode in which Chi Chi and Goku fight is episode 137. It's also the episode in which Chi Chi becomes Goku's fiancee.
its episode 162