(a lot to talk about!)
I just defeated the Gym leader Koga to get the Soul Badge which increases the defense of "all" my pokemon and allows any pokemon with the move Surf to use it outside of battle,also he gave me the tm move Toxic which is pretty much a stronger venom like attack that damages the health of a pokemon worse than others "each" turn as opposed to "ordinary" health deteriorating moves that only damage the same amount each time,also during my battle's in Koga's gym my Weirdo Spearow learned the move Pursuit by replacing Fury attack which I felt was more "useful" and "fitting" because it allows it to attack a pokemon before it can switch out and it's pretty strong at that(been used on me several times effectively)also my Harp Gyarados learned Leer in place of Splash because naturally since Splash effectively "does nothing" and Leer is an Intimidating move that reduces an opponent pokemon's defense I felt it was a great fit,especially when thinking back to the episode of a harmless Magikarp of James's turning into the enormous frightening and tough Gyarados and joining others in Dragon Rage,definitely a move that it is noticed as one that "works" overwhelmingly alongside the move Dragon Rage!