Pokemon Brilliant Diamond & Shining Pearl: How to Get Porygon2 and Porygon-Z

Pokemon has a habit of introducing new evolutions for older Pokemon in new generations. One example is Porygon, who obtained a second evolution in generation 2's Pokemon Gold/Silver. Then, when Pokemon Diamond/Pearl was announced, Porygon2 could evolve into Porygon-Z. Fortunately for some trainers, the methods of evolving Porygon and Porygon2 haven't changed over the years. Those familiar with the Porygon-line will know that to get Porygon2 and Porygon-Z in the recent Pokemon Brilliant Diamond and Pokemon Shining Pearl, they will need to trade with another player.

Source: Gamerant