Assuming you're talking about breeding, what Pokemon you get depends on the genders. If you have a female Plusle and a male Minun, you get a Plusle, while a female Minun and male Plusle gives you a Minun.
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Pokemon DP 162
Plusle has higher sp attack while minun has higher sp defense. It's now up to your opinion
No,they don't.
When You start the game, Plusle or Minun will appear depending on which gender You choose. If You choose male, You get Minun. If You choose female, You get Plusle. The Pokémon You did not get as a partner will be registered in Your Browser, when You beat the game.
Since plusle and minun are Hoenn Pokemon you have to wait till Wednesdays and go to the Pokemon March station,turn on the Hoenn sound show, and go to routes 1,2,3,4,5,7,8, and the National Park