poke-mode is a major mode for editing Poke source files,
i.e. .pk files. It provides font-lock, auto-completion and
indentation features.
poke-mode is no longer part of the poke source, it is available
from GNU ELPA instead and can be installed via M-x package-install
ret poke-mode. You can automatically load poke-mode by adding it
to auto-mode-alist:
(add-to-list 'auto-mode-alist '("\\.pk\\'" . poke-mode))