[Scripting Question] Mega Evolution with Zen Mode Ability

I'm trying to create a mega evolution which can change form, I thought the simplest way to do this would be to give the Mega Evolution the ability Zen Mode.

When I try to do this I get an automatic Mega evolution when the Pokemon is sent into battle but the ability will activate as normal.

In the Battlers folder I have the Mega evolution sprite as 009_1 and the Zen mode sprite as 009_2
just wondered does anyone know how to stop the automatic evolution or is there a better way of doing this?

My current method was to
- set up a basic mega evolution
- set up an another form
- Give the mega the ability

I'm not sure if i've missed anything but if anyone could help that would be great

The script for Zen Mode within script section "PokeBattle_Battler" is:

if isConst?(self.species,PBSpecies,:DARMANITAN)
if self.hasWorkingAbility(:ZENMODE) && @hp<=((@totalhp/2).floor)
if self.form!=1
self.form=1; transformed=true
end
else
if self.form!=0
self.form=0; transformed=true
end
end
end

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The "@hp<=((@totalhp/2).floor)" probably checks for 1/2 HP in order to transform. You can check if you have that in your own script.

You can also try something without relying on Zen Mode as well.

I was working on something similar to this about a week ago, Here's what I did in general:

if isConst?(self.species,PBSpecies,: POKEMONNAME) && hp>0
case @battle.pbWeather
when PBWeather:: SUNNYDAY
if self.form==1
self.form=2
transformed=true
end
else
if self.form==2
self.form=1
transformed=true
end
end
end

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This allowed for a Mega Evolved Pokemon to form change during Sunny Day.

And yes, I believe naming the changed form sprite as "_2" is right.

Yeah Zen Mode is basically what I want to happen,
Its just i only want the mega form to have the ability but it seems to activate mega evolution straight away