While there have been reasons provided by Pikachu over the years for why it doesn't want to evolve, the truth may well be that, regardless of whether it wants to, Ash's Pikachu simply can't evolve.

Every generation of Pokemon has added a new creature that can be seen as a clone of Pikachu, how do all of them stack up?

Then, using X Speed, they can swap Pikachu ex into the active space to take out heavy hitters before the opponent can fully evolve them, or before they are completely loaded up and ready to attack.

Originally designed to be the first part of a three-stage evolution line in Red and Blue, Pikachu evolves into Raichu through the use of a "Thunder Stone" item, with Raichu intended to be able to ...

hat-wearing Pikachu and Floragato shiny. Tinkatink and its evolutions are also making their debut with this event, but you’ll need to hatch quite a few eggs to source enough to evolve one into a ...

With Pikachu, Heracross, Bayleef ... Most of his Johto team did not evolve or get enough battle time to really shine. Thankfully, the Sinnoh League made up for that later. While it wasn’t ...