Okay, kind of long. Here we go:
Format: 1v1 quadruple
Style: extremely, extremely cool.
DQ: 7 days
Damage Cap: 30%
Banned/Restricted Moves: OHKOs, direct healing, Pain Split. Attacks and abilities that rely on gender can be used, but will fail. Chill can be used, but does not restore energy.
Arena Description: The Tree of Dreams
At the center of a clearing on the Island of Dreams lies the Tree of Dreams, an ancient tree rumoured to grant wishes to those who leave offerings of berries at its roots. The area around the tree is pretty unremarkable; it's covered entirely in grass, but this being the Dream World, Pokémon are able to summon the resources to use any attack of theirs that they please (save for banned moves), and Pokémon that normally need water to move around will have no trouble maneuvering on this terrain.
Before the battle begins, the tree is willing to grant each Pokémon a wish to grow stronger like its friends. Pokémon will, for the duration of the battle, be transformed into any stage of their evolution line that their trainer chooses, and have access to all of that stage's moves and its dream ability in place of their own. Each Pokémon will be disguised as another Pokémon in its trainer's active squad, akin to the effects of a permanent Illusion. There is no way for the opposing Pokémon to see through or remove this illusion; their trainer can only try to guess what species the Pokémon really is from the events of the battle.
Additional Rules:
Status Conditions: Sleep and confusion can be inflicted at most once on each Pokémon (self-inflicted statuses do not count for this). A sleeping Pokémon will sleep for at most two actions before waking up. A confused Pokémon will hit itself in its confusion once on its next action after becoming confused, then be cured of the condition. Paralysis can cause at most one failure to move, but speed is decreased and the condition fades as normal.
Intriguing Illusions: Sendouts, along with the Pokémon to be disguised as and choice of held item that the trainer owns (if applicable), will be PMed to the ref before command order is posted. Each Pokémon is in disguise, and will be described as carrying out all of its actions as if it was the Pokémon it's disguised as (even if they don't make sense! This is the Dream World, after all. The Feebas in it are perfectly capable of using Wing Attack and Jump Kick.) and all of the information displayed in its summary (sprite, ability, etc.) will be that of that Pokémon. Actual type matchups, Inherently/consensually hovering/flying status, etc. will still be that of the actual Pokémon.
The ref is requested not to provide any details about individual damage and energy calculations, only the final tallies. If, say, a Pokémon's actual ability is activated (for example, Guts), the ref is requested not to mention this in the Pokémon's status; the other trainer will have to try to notice it on their own from the events of battle or final tallies! Basically, the ref is asked not to reveal anything or give hints about any Pokémon's actual identity (like, idk, putting something like "The Sneasel giggled in a very non-Sneasel-like way reminiscent of a dog Pokémon" or something in the flavour).