I just saw this topic for the first time, so I don't know if in the previous 10 pages anyone has proposed a permanent Gravity ability. You guys arguing Trick Room have your work cut out for you, but Gravity, Wonder Room, and Magic Room are totally different beasts in and of themselves...
new: Gravity Well: The Pokemon summons constant Gravity upon entering battle.
This would require some mechanic adjustments, as currently, Gravity can only be removed through the five turn countdown. Using Gravity after using Gravity will give the message "but it failed". So, this would have to augmented so something could cancel Gravity conditions provided by this ability. I suggest subsequent Gravity (move) uses, removing the Pokemon through Roar (etc.), or fainting the Pokemon with the ability. But then this would also limit the ability's effectiveness because it would need to be on the field to work. Haze maybe...?
old: Infiltrator: Ignores Safeguard, Light Screen, Reflect.
new: Infiltrator: Ignores ",",", defense and special defense boosts, "cure" berries, and evasion boosts.
This would cause a shift in Infiltrator usage, as things that like Lum Berry, Bulk Up, etc. would have a hard time keeping up with defense ceilings.
I like the ideas about changing Illuminate, but make it modify opponents' moves by 8% of the total accuracy to keep it decently fair. For example, Water Gun would have 92% accuracy, Razor Leaf 87.4%, Stone Edge 73.6%, etc.
old: Illusion: Pokemon switches in disguised as the Pokemon in the last slot.
new: Illusion: Pokemon switches in disguised as the Pokemon in the last slot, and takes/ doesn't take damage from weather, entry hazards based on the Pokemon it's disguised as.
This needs to happen, like now. Illusion was a cool concept in theory for Zoroark, but it really limits it's potential from what it could have been.
old: Magma Armor: Pokemon cannot be Frozen. Thaws a Frozen Pokemon if it gains this ability somehow in battle.
new: Magma Armor: ". Also, Pokemon is not affected by Ice-type attacks, nor the damaging effects of hail.
Seriously. We have multiple abilities that prevent hail damage already, and only 1 Pokemon is actually immune to Ice-type attacks (Shedinja). This ability is currently arguably the worst in the game next to Honey Gather, Tangled Feet, Anger Point, Illuminate, and Run Away.
old: Oblivious: Pokemon cannot be infatuated, nor captivated. If the Pokemon gains Oblivious somehow in battle and is in love, it will stop being in love.
new: Oblivious: ". Also, Pokemon ignores the power boosts from all consumable/held items in battle (!).
That's right. The anti-Choice. You heard right. It's not like their going away anytime soon. Stall forever, FTW!!! That means gems, Petaya berries, Life Orbs, etc. I personally hate them anyways.