Once you have won all of the cups and defeated the Gym Leader Castle, a new aspect arrives in the main area of the Pokémon Stadium. Above the stadium itself, a silhouette of Mewtwo appears. This brings a final battle with the legendary Pokémon that can be repeated at will.

Defeating Mewtwo can be really tricky, though you can use an entire 6 Pokémon team against Mewtwo itself. Once defeated in Round 1, it will open up the hard mode of the game: Round 2. After defeating everything in Round 2, you can challenge Mewtwo again, but Mewtwo is far stronger

Rules

GameBoy Usable: Yes
Rental Pokémon: Yes (Prime Cup Rentals)

Level Cap: Level 1 - 100
Allow Same Pokémon: No
Pokémon Useable: All
Sleep Clause (No more than 2 Pokémon Asleep): No
Freeze Clause (No more than 2 Pokémon Frozen): No
Self KnockOut Clause (Final Pokémon fainting at the same time as opponent equals loss): Yes

Round 1

Mewtwo Mewtwo
Battle Type
Single Battle
Attacks:
Psychic
Rest
Thunderbolt
Blizzard

Round 2

Mewtwo Mewtwo
Battle Type
Single Battle
Attacks:
Psychic
Rest
Thunderbolt
Amnesia
 
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