Everything is 'doable' per se, the task is just a bit 'awkward' to explain. As it's 'simple' in some ways, but it depends on the desire effect.
If just want to change the 'menu' and 'black out screen'. Which menu? You'll need to locate the script which houses said menu and change the flavor text.
Example, to change the 'pause menu' flavor text, search for "class PokemonPauseMenu_Scene" and it's that script.
You'll change
Code:
commands[cmdPokemon = commands.length] = _INTL("Pokémon") if $Player.party_count > 0
to
Code:
commands[cmdPokemon = commands.length] = _INTL("Bob was here, BOB!") if $Player.party_count > 0
It's likely you're newer to the script and stuff, have patience. Try to think about it logically, everything is set up previously by other humans coders.
Think of all the scripts as pages to a book which holds all the pages together making the 'game'.
If you want to change all instances of "Pokemon" simultaneously.
You'll need an 'editor', or something capable of making multiple changes, like 'atom editor' or something.
Then you'll CTRL + SHIFT + F to search all instance of "Pokemon" and "PokEmon", then you can change all those instances to "bob" or anything.
The issue is, some instance of the word "Pokemon" may be important to how script operates, e.g. they aren't flavor text.
