Overpowered abilities, attacks, moves, perks, etc. that have made a game too easy

[Mr_No]

Player2 said:

Pokemon RBY - Amnesia (Move), Psychic (Type)

Gran Turismo 2 - Suzuki Escudo

Wow, I almost forgot about these two, though I remember more the Suzuki Escudo Pikes Peak Version. After I got it by selling a bunch of R30 Skyline Silhouette Formula ($250k each), bought it and the game turned a breeze after that.

But on Pokemon Blue Version, I remember more that the Psychic attack was very OP against almost every Pokemon.