It was a swell night at the Super Smash Bros Mansion in the middle of the city of Earthbound's Fourside, constantly changing locations to suit the mood for any particular fanfic. Although on that note, from what was about to happen, you wouldn't think it was the same exact night...
"Oh no, oh no, oh no...!" Pichu panicked as she was searching frantically in her room.
Pikachu came in as he noticed the younger, smaller electric mouse Pokemon scurrying about, prompting him to fold his stubby arms together. "All right, what is it this time, Pichu?"
Pichu squinted her eyes as she turned to Pikachu nervously, touching her small fingers together. "You remember how we got a Chain Chomp was one of the new Assist Trophies...?"
"...Yes..." Pikachu slowly answered as he nodded his head, feeling concerned. "Pray tell, where is it?"
Pichu gulped as she opened her eyes, facing Pikachu as she shook her head. "That's... the problem. It got loose, and well..."
Loud screams were heard in the hallway as Pikachu and Pichu ran out of Pichu's room, both of the electrical rodents getting flattened by the swarm of feeling Pokeball Pokemon, with several angry Chain Chomps chasing after them as several rotating bars of red flames appeared behind them, invisible coin blocks popping up after the Chain Chomps bumped briefly into them, with Bullet Bills firing off in all directions. Pichu popped back up as she screamed in horror, running around in circles as she had no idea what to do of the situation, with Pikachu simply groaning as he couldn't feel a thing in his body.