Pokémon Stadium 2
Pokémon Stadium 2 (ポケモンスタジアム2 Pokemonsutajiamu 2) is a stage for Super Smash Bros. Brawl, based on (as its name suggests) the Pokémon universe. The basic layout of the stage is essentially unchanged from Super Smash Bros. Melee's Pokémon Stadium, save for a major graphical upgrade, including a huge space between the crowd and the stadium. The name of this stadium might be a reference to the game Pokémon Stadium 2 for the Nintendo 64. As with the original Pokémon Stadium, every so often, the stage transforms to represent a certain Pokémon type (see "Elements" below). However, unlike its predecessor, Pokémon will occasionally appear in the background.
 Tournament legality
This stage is sometimes allowed as a counterpick in more liberal stagelists, but is usually banned in tournaments. This is because of many players see its transformations as heavily disruptive and too detrimental to gameplay; the electric transformation produces fast conveyor belts that easily push players off the stage and often result in self-destructs for less skilled/experienced players, the wind transformation significantly reduces gravity, which slows aerial approaches and results in earlier vertical KOs, and the ice transformation creates slippery terrain which alters how one must move on the stage as well as slightly increasing the chance to trip. Additionally, like PS1, all its transformation except for ice are susceptible to camping (though to a lesser degree than PS1).
However, PS2's legality has been heavily debated, with some players vouching for it and arguing its transformations to not be as disruptive as commonly claimed. They point out that self-destructs on the electric stage are due to player error and are avoided by players who properly play the stage, while also arguing that players who can't handle the conveyor belts can easily plank for the duration of the transformation (which is pointed out to not be functionally different than camping out a transformation on PS1 as is what commonly happens there). With the wind stage, they argue that while a stage that was permanently like that would be too detrimental for gameplay, for being there a mere 30 seconds (or minute) of the match its effect is too minor to warrant banning the whole stage, and that a sufficiently experienced player will never lose to a lesser skilled player because of it (this is additionally argued for the electric stage). With the ice transformation, its argued that its effect is actually beneficial on gameplay, as the boosted speed and slide distance of DACUSes and slide smashes, the ability to slide with other attacks, and the increased sliding distance when shielding (which makes it more difficult to punish out of shield), allows the defensively-inclined Brawl to be played more offensively. PS2 supporters additionally point out that PS2 is arguably the most neutral stage in Brawl, where few characters, if any, gain a real advantage/disadvantage from the stage, as its very neutral standard stage and highly varying transformations neutralises advantages/disadvantages characters may have on the stage.
Despite the arguments of its supporters, the majority of players refuse to touch the stage regardless, and thus it is often banned outside liberal stagelists.
There are four possible stage transformations, each of which represents a particular type from the Pokémon games. While this feature was in the Melee version as well, the types represented in Brawl are all new. Whenever the stage transforms, the layout of its platforms changes, and in some cases the very physics of the game becomes altered as well. There is no specific order that these elements appear in - the stage transformation is completely random and it is even possible for the stadium to change into the same type twice in a row. However, the stage always begins on the standard arena and has to revert back to its normal state before transforming again. The elements are as follows:
A new feature in Pokémon Stadium 2 is the guest Pokémon who appear in the background of altered stages. They have no effect on the battle itself, but provide a nice addition to the scenery.
 Easter egg
In the Stadium's Ice mode, there is a cabin in the middle of the stage. Hidden in the cabin is a poster of a kitten as well as what looks like the Wii Hint Cat on the same poster. It is unknown whose kitten is pictured on the poster, but it is rumored to be Masahiro Sakurai's.
A stage such as this has never been seen in any main series Pokémon game. There have been flat areas where trainers would do battle, but they were always inside buildings called gyms. One reference could possibly be from the game Pokémon Stadium. The arenas in Pokémon Stadium have the Poké Ball logo in the center with crowds watching the battle. Another possible origin is from the anime. There have been gyms with a theme based on a Pokémon type, such as rock or electric, and the scenery would change to match the theme. However, the exact arrangements in this stage have never been seen in a Pokémon title. A possible source of inspiration for both this stage and its predecessor is the Pokémon anime television show, in which type-transforming arenas featured during the Pokémon League.
It is unconfirmed as to which region exactly the stage is set in, but reasons can be found for each region in the mainstream games.
Comparing with the background (skyscrapers), it may be Saffron City or Celadon City of Kanto, Goldenrod City of Johto, Lilycove City of Hoenn, or the Fight /Battle Frontier of Sinnoh. It may be a mix, if the buildings seen are from various cities/regions. Alternatively, it may be White City from the game Pokémon Stadium 2.
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