In several, there are too many to list. He is a fighter, he gets hurt all the time.
He gets hurt in the very first episode to give an idea.
It's the one where they battle the gym leader with a raichu and ash tries to use a thunderstone on pikachu
Episode 365
Pikachu loses its memory in the episode titled "A Scare To Remember."
the episode from the season 1 is Pokémon Paparazzi
The first time Pikachu used volt tackle was episode 427-May's Egg-Cellent Adventure.
episode 520 throwing the track switch when pikachu and ash ate to much
He does not meet a pikachu what are you talking about?!
In episode 39, "Pikachu's Goodbye", Ash attempts to release Pikachu to look after a group of Pikachu that had just been targeted by Team Rocket. But Pikachu returns to him at the end of the episode. That was the last time Ash tried such a thing.
Ash is turned into a Pikachu in a Season 5 episode, the Season is titled "Pokémon Master Quest." The episode itself is Episode 243 and the episode is titled "Hocus Pokémon."
Buneary never used Attract on Pikachu.
NONE
yaaa