Ash's Pikachu (Forever)

Ash's Pikachu (Japanese: サトシのピカチュウ Satoshi's Pikachu) is the first Pokémon obtained by Ash on his journey as a Pokémon Trainer

Prior to Power Rangers Forever: Kalos Arc
Pikachu was one of the starter Pokémon that Professor Oak give out to new trainers. Ash was given Pikachu to challenge the Indigo Legaue.

Power Rangers Forever: Kalos Arc
TBA

Power Rangers Forever: Time Travelers Arc
TBA

Power Rangers Forever: Alternate Dimension Arc
TBA

Power Rangers Forever: Kalos League Arc
TBA

Power Rangers Forever: Kalos's Crisis Arc
TBA

Trivia

 * Pikachu is the first Pokémon in the anime to defeat a Mega Evolved Pokémon without Mega Evolving, defeating Korrina's Lucario.