[Scripting Question] Help with a custom ability code

Hello everyone,
so I made this ability called "King of Rats" which belongs to a single Pokémon. This ability is meant to give this Pokémon a x2 power boost on Electric-type attacks when another electric regional rodent is in the field (Pichu, Pikachu, Raichu, Plusle, Minun, Pachirisu, Emolga, Dedenne and Togedemaru) <meaning the Pokémon can either be on its side of the battle or in the opposite team> and also receives x0.5 damage when this condition is applied.
I think something like Plus and Minus should work, but instead of getting its effect from another ability it should get it from those specific mons.
Where should I start? Any hint you can give me? I'm very new to this and coding is not one of my strengths.
Thank you in advance.

In the script section

PokeBattle_Move

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search for

##### Calculate attacker's attack stat #####

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there you can add a rule for your ability for the attack boost.
It could look like

if attacker.hasWorkingAbility(:KINGOFRATS) && isConst?(type,PBTypes,:ELECTRIC)
if for i in 0...4
!attacker && (isConst?(i.species,PBSpecies,:PICHU) || isConst?(i.species,PBSpecies,:PIKACHU)|| isConst?(i.species,PBSpecies,:RAICHU)|| isConst?(i.species,PBSpecies,:PLUSLE)|| isConst?(i.species,PBSpecies,:MINUN)|| isConst?(i.species,PBSpecies,:PACHIRISU) || isConst?(i.species,PBSpecies,:EMOLGA)|| isConst?(i.species,PBSpecies,:DEDENNE)|| isConst?(i.species,PBSpecies,:TOGEDEMARU))
#make sure to either have all the conditions in one line or have the previous line end with ||
atkmult=(atkmult*2).round
end
end

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For the damage reduction you search for

##### Calculate opponent's defense stat #####

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and pretty much enter the same conditions with 2 differences.
1.

if opponent.hasWorkingAbility(:KINGOFRATS)

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instead of

attacker.hasWorkingAbility(:KINGOFRATS)

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2.

defmult=(defmult*1.5).round

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instead of

atkmult=(atkmult*2).round

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I haven't tested it myself so I'm not sure if it will work out exactly like that, but it should give you an idea of how it could work. Let me know if you could make it work. If you want the AI to make use of the ability as well, don't forget to add it in the AI section.

Sorry for the late answer.
Thank you, I think it's working. I'll give you credits in the game as soon as it's finished.