My favorite game when i was a kid. Awww the memories
The game is very basic. You can upload Pokemon from your Gameboy, or use ones installed to the game, and have battles with computer players, or friends and family! You can also play the actual Pokemon GameBoy game on the screen by entering a special menu! also, there are tons of mini-games that you can play for hours of enjoyment. Finally, there's the Boss Battles. You go to fight Gym Leaders and Pokemon Masters in a special "adventure" like mode which can get very competitive and addicting.
And it has MINIGAMES!!! (i know i already said that)
Overall, Pokemon Stadium served as a good Pokemon game and was among the last of the classic Pokemon games. Gamers and Pokefans from all around, I suggest you play this game.