In the Pallet Town Pokemon Center..
An Eevee is sitting on a man's lap,
"So this is an Eevee that can't evolve?" John asked,he was surprised that Eevee was actually the Partner Eevee that's your starter in Let's Go Eevee,
"Yes, and it was actually a Pokemon in my lab that refused to get caught, but it naturally knew mimic, which is quite rare," Oak answered,
'Come to think of it, Eevee did know mimic..' John thought, but dismissed it almost immediately,
But suddenly, the lights went out,
"Nurse Joy! Is it a power outage? How is all of us going to heal our Pokemon!" A random trainer exclaimed,
"It's just going to take a moment to turn the power back o-" Nurse Joy got cut off by a very familiar sound,
"Marshadow!!!" Marshadow appeared,
"Is that a Marshtomp?!" One trainer exclaimed,
"Of course not! It said 'Marshadow!' If anything, we should be ecstatic of a new Pokemon!" Another exclaimed,
Now most of the Pokemon center was in a ruckus to catch Marshadow, one threw a Pokeball which Marshadow kicked back and it hit a trainer's face, another made a Lucario use Aura Sphere which missed and demolished a hole into the building,
"A new Pokemon? I need to document this immediately!" Oak exclaimed,
'Marshadow? The Pokemon that corrupted Ash's thoughts in I Choose You?' John didn't watch Pokemon movies but got told of the basic plot by his friends in highschool who unfortunately are not here right now,
"E-vui!" Eevee copied a trainer and used Aura Sphere, but the Sphere was grabbed by Marshadow and turned into a Shadow ball, which hit a trainer's Machoke and then the Machoke fainted.
"Mar!" Marshadow used Shadow punch and hit a certain Eevee, who fainted,
Meanwhile..
"!!!" A red-capped boy exclaimed, while a Charizard blasted out a very large blast of fire on a Gyarados, and then the Gyarados fainted,
"Agh, losing is no fun.." The trainer of the Gyarados said, as he lost,
The red-capped boy went back inside the Pokemon Center, unaware of the chaos inside..