Pokemon: Who Are Pikachu's Biggest Rivals?

gamerant.com:

Pikachu may be a formidable opponent during official matches since Pokemon's debut episode, but the fluffy yellow Electric-Type has been known to stir the pot off the battlefield too. As Ash's first and favorite Pokemon, Pikachu has a bit of an ego about him, and his pride has caused some unnecessary conflict in the past.

However, there have been times when Pikachu's hostility is entirely warranted, in moments when his friends are put in danger, and he goes into protective mode. All in all, most of Pikachu's rivalries provide some entertaining comic relief and allow viewers a glimpse into the unique interactions between Pokemon, emphasizing their individual personalities.

Pokemon: Why Can Meowth Talk?

With a rivalry as old as the Pokemon franchise itself, Pikachu vs Meowth is a contemporary spin on the classic Tom and Jerry tale, as the feline Pokemon consistently pursues the yellow mouse, and is comically thwarted at every attempt. What irks Pikachu more than the constant conflict is the fact that Ash is regularly endangered during their outlandish schemes, and poor Pikachu is often restrained and unable to assist.

In «Pokemon Shipwreck», Pikachu's hatred for Meowth is emphasized when he snaps his fingers in disappointment when Ash discovers that Team Rocket had not died, and makes no attempt to assist the half-drowned cat. However, after time, Pikachu slowly starts to warm up to Team Rocket and is often seen conversing with Meowth. His newfound affections are affirmed in «Pikachu Translation Check,» when Jessie and James gush over all the moments Pikachu showed kindness to his rivals.

When it comes to Raichu, Pikachu does not discriminate and seems to hold great disdain for all of his evolved forms along the way. The first