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You can get rid of exactly one Pokemon and replace it with another of your own design. This new one will must have the exact same stats and typing as the old one, but everything else is fair game. If it replaces a pokemon that's part of an evolutionary line, it will be a part of that line. What do you do?
Pic related, as far as region rats go, this is probably the worst. More so than bibarel. Really, all I'd do with this though is replace it with an "it got bigger" evo for Patrat, with a more natural looking stance and less glaring color scheme, cause even that would be better than this.