Coming in at #15 on the list is, Pokemon Stadium 2. Back in Melee, the original Pokemon Stadium stage was one of my favorite stages in the game. (The Original is probably in the Top 5 for my favorite Melee stages.) With Brawl, Pokemon Stadium 2 plays very similar and as fun as ever as the original Stadium stage back in Melee. Aside from one minor gameplay problem in the stage, Pokemon Stadium 2 is another above-average decent stage to play in Brawl.
Like Summit, there is only one minor negative problem I had with for Pokemon Stadium 2. One of the gameplay changes in Pokemon Stadium 2 is at times unbalanced and very bland to fight on. There of the four different element changes in this stage. Ground, Electric, Flying and Ice with three of them IMO, being fun to play in. Again, One of the four gameplay changes in Pokemon Stadium 2, is very bland and at times cheap to fight on.
The best element changes in Pokemon Stadium 2 are, the Flying, Ground and Ice changes in the stage. The flying element change is my favorite of the four since when Flying is in play, the stage loses gravity, causing everybody to battle each in different directions of the stage in the air. This part of Pokemon Stadium 2 is unique, fun and most importantly balanced. You rarely if ever, have to worry about yourself dying while the Stage is in Flying mode as the air floats you back to the edge of the stage or up in the middle of the stage back to the action fighting your opponents.
The Ground and Ice changes in Pokemon Stadium 2 are decently fun. Even though, The Ground change in Pokemon Stadium 2 at times bland, it is fun to play on and the most well balanced of the four as there are no real interactivity in the Ground section of Pokemon Stadium 2. The Ice Type section in Pokemon Stadium 2 is also, decently fun to play on. While fairly bland to fight on at times, it has it's moments as you have fun with your opponents knocking each other back and forth in different directions in the Ice.
Before I move on to the real negative of Pokemon Stadium 2, the "default" stage section in Pokemon Stadium 2 is fun and well balanced to fight on as there is enough arena room to recover in and battle your opponents in.
As for the main negative with Pokemon Stadium 2 is the "Electric Type" section change. The biggest problem I had with for the Electric Type section of the stage is that, it feels at times frustrating and cheap to fight in. The main thing that happens in Electric Type form in the stage is that, you and your opponents fighting on moving generator platforms that move side to side in the arena trying to knock your opponents off the stage. This at times feel cheap as if you step on one of the generators for no more then a few seconds, your character is forced to one sides in the stage and if you are not careful, your opponent could next to you and knock you off the edge as resulting of a KO. This play a fair amount of luck as it is easy for you to be moves from one side to the next side of the generators to the off the edge in the stage. Not to mention, if you had a slow character like Bowser and Ganondorf, you would have a hard time fighting on the Electric Type section in Pokemon Stadium 2.
Overall, aside from a minor gameplay section problem in one the element changes in the stage, Pokemon Stadium 2 is another one of many stages in Brawl that have fun moments here and there to fight on and is classified as a above-average to good stage in Brawl.