Player chooses from list of sprites?

[3ct]

This isn't the ideal place to ask Pokémon Essentials-related questions, but no one is helping me over at Pokécommunity so...


Anyway, there's an event in my game that activates a quest as long as the player has a certain pokémon in his party. The player chooses the specified pokémon and his sprite is thereupon turned into said pokémon with $game_variables[34]=X, X being the name of the sprite in Graphics/Characters. (The PNG file name has to be followed with an "n" and/or an "r," because that's just the nature of Essentials. It differentiates walking and running animations.)


Here's a picture of the event: Event with Constant


Now, the problem with this is the player has to abide by very specific parameters in order to start the quest. Instead, I want the player to be able to choose ANY pokémon in his party and become that sprite. These sprites live in a folder called "Overworld," separate from "Characters." Here's an idea of what the script could look like:


def pbPokeSpriteFile #calls the action
if $Trainer.party.length>0 #checks to see if the player has 1 or more pokémon
outfit=$Trainer ? $Trainer.outfit : 0 #not sure if this does anything
pbChoosePokemon(1,34) #opens pokémon selection screen.
if pbGetPokemon(1).isShiny?
$game_variables[34]=sprintf("Graphics/Overworld/%03ds",poke) #ignore this
else
bitmapFileName=sprintf("Graphics/Overworld/%s%s",
getConstantName(PBSpecies,species)) rescue nil
bitmapFileName=sprintf("Graphics/Overworld/%03ds%s",34,outfit)
return bitmapFileName
$game_variables[34]=bitmapFileName #here, 34 is the player's sprite
end
end
end


Now, this would either result in argument errors or it'd simply just erase the player's sprite entirely, as if the script and the "Overworld" sprites weren't communicating. After pbChoosePokemon, I'm pretty much clueless as to how to relate the player's choice to the respective PNG file in the "Overworld" folder. I could do each pokémon individually, since I can't seem to understand how "sprintf" works, but there's still the problem of changing $game_variable[34] to anything outside of the "Graphics/Characters" folder.


I'm using RPGMaker XP with Pokémon Essentials. Thanks for any help in advance.