Pokémon Stadium Gold and Silver

Hundreds of Pokémon in Three-mendous 3-D! What's sweeter than victory in a Pokémon battle? Victory in a 3-D arena on the N64! Set your strategy then stand back while your Pokémon battle it out. You can even see the Pokémon you've trained rendered in 3-D and ready for battle!

Nearly 250 Pokémon! Transfer Pokémon from the Red, Blue, Yellow – even Silver and Gold – versions of Pokémon for Game Boy. Or play with Rental Pokémon from the game.
See them all in glorious 3-D! Pit Ho-Oh, Lugia, Entei, and Pichu against all-time favorites like Mewtwo, Charizard, Blastoise, and Pikachu.
Become the Stadium Champion! Take on 21 Pokémon Trainers in the Gym Leader Castle and try to win it all!
12 all-new mini-games! Try to bump the other Hitmontop out of the arena in Topsy-Turvsy or charge up more energy than anyone else in Pichu's Power Plant.

Source: TheGamesDB