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Imagine this thing as a nervous looking bird with a fuse on its head. It's dex description could be something to the effect of: this little round pokemon has the ability to blow up a small town, but is terrified to do so.
Then you use self destruct during battle and revive it. It's typing changes due to it's explosion, it's colors turn to ashy and black, and his nervous expression is now a furious expression.
"This Pokemon grew bitter after exploding and wants nothing more than to blow more things up."