So your character spent a number of years doing what ever before you decided to join up with Team Snagem. Why don't you give us a short story of a moment in your character's life. Where did they grow up? What made them decide to join Team Snagem? It can be whatever you want, just have it ending with them joining Team Snagem, or deciding to. Furthermore in this scenario reveal your character's lone Pokemon. It can be any first stage non-legendary Pokemon that still evolves. That is your starter Pokemon. Also try and include a battle in this scenario.