U can't catch prinplup u only can evolve it from piplup and to get piplup is to cheat or at the start of the game u choose piplup as the starter
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Prinplup
If you chose Chimchar as your starter, your rival will eventually get a Prinplup. Also, at the Pokémon mansion, one trainer will have a Prinplup.
Prinplup evolves into Empoleon on level 36. Piplup evolves into Prinplup on level 16.
Prinplup is a Water type pokemon.
You get prinplup when piplup evolves. To get piplup you either pick chimchar, turtwig, or piplup.