[Scripting Question] Need help for a new Ability

[Quibbi]

Hi, I'm new to Essentials (using v20.1). I'm trying to make an ability that settles the trick room when the Pokemon enters the field. But I have no idea of how to do it.
I've tried to copy and modify the electric surge ability, copying and pasting the TR move to the ability and a lot more. As said It's the first time I'm digging in the scripts and I don't know about programming at all. So If anyone could help, It would be appreciated.

(I already made the PBS changes, and defined the ability)

 

[Swdfm]

#-------------------------------
# Tricky
Battle::AbilityEffects::EndOfRoundEffect.add(:TRICKY,
proc { |ability, battler, battle|
next unless battler.turnCount == 0 || battle.turnCount == 0 # First turn out!
battle.pbShowAbilitySplash(battler)
if battle.field.effects[PBEffects::TrickRoom] > 0
battle.field.effects[PBEffects::TrickRoom] = 0
battle.pbDisplay(_INTL("{1} reverted the dimensions!", battler.pbThis))
else
battle.field.effects[PBEffects::TrickRoom] = 5
battle.pbDisplay(_INTL("{1} twisted the dimensions!", battler.pbThis))
end
battle.pbHideAbilitySplash(battler)
# Room Service
if battle.field.effects[PBEffects::TrickRoom] > 0
battle.allBattlers.each do |b|
next if !b.hasActiveItem?(:ROOMSERVICE)
next if !b.pbCanLowerStatStage?(:SPEED)
battle.pbCommonAnimation("UseItem", b)
b.pbLowerStatStage(:SPEED, 1, nil)
b.pbConsumeItem
end
end
}
)