One day Batman was out on the streets of Gotham, protecting it from the villainous sorts, when the Bat-signal appeared in the sky. Hiding in the shadows, Batman proceeded to go to Commissioner Gordon in order to get commissioned.
When he got there however, The Joker had taken Commissioner Gordon hostage! After unleashing his trademark laugh he said,
"Batsy! It's been a while! If you want your precious Commissioner returned to you alive, you will have to... defeat me in a Pokemon battle! Mr. Mime, go!"
Because he's Batman, he was prepared, and he took a Batball (Pokeball for Batmen) off his utility belt and gruffly said,
"Crobat."
The Joker started the battle with a Psychic attack, which dealt significant damage to Crobat, as it was super-effective, Batman used Poison Fang, which was also super-effective, as Mr. Mime is Fairy-type now for some reason. Luckily for Batman, his Crobat scored a critical hit!
The Joker wasn't fazed, he simply laughed and said,
"Conkeldurr, go!"
The Joker used Rock Slide, which knocked out Crobat!
Batman sent out his second Pokemon, a Swoobat!
Swoobat used Psychic, which 1 hit KO'd Conkeldurr!
The Joker, looking slightly concerned, said,
"I'd like to see you beat my final Pokemon, go, Grumpig!"
Batman, now fed up of this shit, Bat-kicked The Joker out of the window, broke Grumpig's neck, gained 1053 EXP, rescued Commissioner Gordon, went to the Batcave, and ate a pie.
Fin.
