Remaining practically identical to its predecessors, with the addition of Pikachu and the ability to obtain the three regional starters in this adventure, Pokémon Yellow is just as fun as the other two games. The Pikachu that follows you and reacts according to its mood adds a special charm to the game. However, aside from the happiness system, which would be further developed in Pokémon Gold, it is more of the same as Red and Blue.
This was the first Pokémon game that I played where I didn't just level my starter at the expense of all others (go figure!). Brock was absolutely impossible for me until I stumbled upon Butterfree's confusion learned when it evolves at level ten. This fact is burned in my memory forever because the dopamine rush upon finally defeating that Onyx seared my little kid mind permanently. A game that has left such an impact on me can only earn full marks.