[Foreigner]

Код:

@echo off
setlocal

pushd "%~dp0"

for /f "tokens=*" %%i in ('dir /b *.ass') do call:ren "%%i"
goto:eof

:ren
for /f "tokens=5" %%i in (%1) do set "num=00%%i" 

copy %1 "C:\Some\Folder\Fairy Tail - %num:~-3%.ass"