There were several pokemon bootlegs released, one I played had you calling the pokemon (yes they have phones) and asking them to join you. You had to beat them first.
it was actually just a hacked version of Telefang
http://www.gamefaqs.com/gbc/578714-keitai-denjuu-telefang-power-version/images
^ask him if it's that
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http://www.youtube.com/watch?v=7MwZfXy9mA4
http://osu.ppy.sh/stat2/shinytentacool-0.png