Hi
Here are some scenarios :
(Y/C) : Your character
(Y/P) : Your Pokémon (as in Pokémon character.)

W/ trainers :

Scenario 1 : (Y/C) just passed the trial to be a member of the galaxy corps ! It was fairly easy, but it was only for a few meters and it was catching a single Pokémon.
The following morning, (Y/C) is tasked to seek out twin siblings/sisters, as they are supposed to guide them throughout all Obsidian fields.
They started to walk towards the main gates, and saw to girls talking to each other. The brown/red haired one noticed them, waving at (Y/C).
(You may take it from here.)

Scenario 2 : It was supposed to be easy. All they had to do, was get out, get mushrooms, and go back home. But no, fate had other plans, and here they were, in the middle of the night, hiding from drifloons and other wild Pokémon that could potentially attack them.
And that's what happened.
Because drifloons or whatever the heck was big round a purple, can TELEPORT. And such, attack without being noticed.
They were going to die there.
Until...
Small, orange and bright butterflies flew towards them. It was warm, comforting...Not even noticing that the Pokémon was gone until a girl with bright yellow hair towered over them.
"Hey, you are aware it's dangerous to wonder around at night, right ?"
"Come on Mitsuko, don't be like that...They must be scared and hurt. We should quickly get back to the camp." The other person spoke, with such gentleness one could cry.
(You take it from here).

Scenario 3: make your own

For Pokemons :

Scenario 1 : (Y/P) is a proud, strong, alpha Pokémon.
They were strong, looked upon to, or feared by many Pokemons and humans, mostly the latter.
But one day, they were minding their business until a small Lopunny came towards them, hoping in a panicked manner.
"You're an alpha right ? That means you're strong right ? I beg you ! Please ! We need some help ! Our friend-". The poor thing couldn't finish her sentence as she was caught off by a sob, she was close to cry by that point.
(You take it from here).

Scenario 2 : It was a hard fight, but (Y/P) won it. But without injuries. They felt close to fainting, mind foggy, senses closing themselves...They weren't going to live the night, will they ?
That's what they thought when they fell to the ground, the pain not even registering.
Until they saw two figures standing above them, they couldn't make out their words, but both sounded worried. The last thing they remembered was being picked up, before everything became dark.
(Basically : Wild Pokémon being treated, rehabilitated, and let back into the wilds. Unless they want to stay with their savior ?)

Scenario 3 : you make it up.