etc/vim/syntax/poke.vim is a syntax highlighter for Poke source
i.e. .pk files. To use it, first place the file in your
~/.vimrc/syntax/ folder on Unix based systems, or in
$HOME/vimfiles/syntax/ on Windows. There are a few ways to tell
Vim to use poke.vim for .pk files, but the quickest is
to add the following line to your .vimrc:
au BufRead,BufNewFile *.pk set filetype=poke