Trick Room, Magic Room, etc. -inducing Ability?

Is there a way to make an ability kind of like Drizzle, Drought, etc. but instead of weather, it brings in Trick Room, Magic Room, Gravity or Wonder Room?

Yes, there is.

In the PokeBattle_Battler script in def pbAbilitiesOnSwitchIn(onactive), add this code to induce the Trick Room effect for 5 turns (for this example, we can call the ability Reverse Order):

if self.hasWorkingAbility(:REVERSEORDER) && onactive && @battle.effects[PBEffects::TrickRoom]==0
@battle.effects[PBEffects::TrickRoom]=5
# Ability and/or effect animations
# In-battle effect text
end

Click to expand...

This code can be adapted for Magic Room, Gravity and Wonder Room by changing the code.

I was wondering about this also. On which line specifically in the section that you referenced does the new script go? Here is what my section in the editor looks like:

################################################################################
# Ability effects
################################################################################
def pbAbilitiesOnSwitchIn(onactive)
return if self.isFainted?
if onactive
@battle.pbPrimalReversion(self.index)
end
# Weather
if onactive
if self.hasWorkingAbility(:PRIMORDIALSEA) && @battle.weather!=PBWeather::HEAVYRAIN
@battle.weather=PBWeather::HEAVYRAIN
@battle.weatherduration=-1
@battle.pbCommonAnimation("HeavyRain",nil,nil)
@battle.pbDisplay(_INTL("{1}'s {2} made a heavy rain begin to fall!",pbThis,PBAbilities.getName(self.ability)))
PBDebug.log("[Ability triggered] #{pbThis}'s Primordial Sea made it rain heavily")