[Question] Pokemon Essentials: Create a specific uncatable Pokemon

I have seen Thundaga's tutorial about creating a switch that makes pokemon uncatchable. But I am trying to make the roaming legendary dogs uncatchable. In my game they hunt you down where ever you are on the map so I can't really use switches. I was wondering if there is a way in the "Throw a Poke Ball" code to check the name of certain Pokemon and return a message that says they are uncatchable, skipping the "catch" animation.
Right here in the code where is says:

# Determine which Pokémon you're throwing the Poké Ball at
battler = nil
if opposes?(idxBattler)
battler = @battlers[idxBattler]
else
battler = @battlers[idxBattler].pbDirectOpposing(true)
end
battler = battler.allAllies[0] if battler.fainted?

could be the key but I just don't understand the code enough to manipulate it.
I had:

if battler == (:ENTEI)
pbDisplay(_INTL("Entei cannot be caught"))
return
end

but that didn't work. Any help would be appreciated.

Heyyyyyy, after watching another one of Thundagas tutorials about Editing Pokemon with Events I can up with an idea of how to code what I'm looking for. Works well so far.
Here's the code:(I added some of the premade code to indicate where my code should go because placement was important.)

def pbThrowPokeBall(idxBattler, ball, catch_rate = nil, showPlayer = false)
# Determine which Pokémon you're throwing the Poké Ball at
battler = nil
if opposes?(idxBattler)
battler = @battlers[idxBattler]
else
battler = @battlers[idxBattler].pbDirectOpposing(true)
end
battler = battler.allAllies[0] if battler.fainted?
# Messages
if battler.species==:ENTEI #the start of my code
@scene.pbThrowAndDeflect(ball, 1) #(optional)recycled deflect animation from when you try throwing a ball at a trainers pokemon
pbDisplay(_INTL("its uncatchable")) #(optional)text telling you the Pokemon is uncatchable
return #
end #end of code