(Note: this is a proof of concept of a Story that may or not happen please put a like if you love this idea)
Basically the plot is that after Matoro sacrifices himself to save Mata-nui, a being known as Arceus manage to revive him and put him in a World made out of a doomed Matoran universe, now inhabited by creatures known as Pokémon.
Matoro woke up on a beach, he then recalls his sacrifice back in his universe until he realized that he has been turned into a Pokémon mainly an Oshawott.
After exploring the beach and his new form, Matoro ends up meeting a male Zorua named Moony.
He and a Pikachu named Shocks are forming an Exploration team and they asked if he could join them.
Matoro accepts the offer in hopes that he can get some answers on this new world.
Matoro soon followed the duo to their hometown in which he learned how to battle in order to defend himself, the trio got attacked by a Pokémon.
the Pokémon looks diseased, has brown splotches all over its body and its eyes are glowing red.
Matoro, Moony and Shocks manage to defeat the crazed Pokémon where it was put in a cage to be treated.
the Pikachu explained to Matoro that these diseased Pokémon start popping out a week ago and the source of this disease is unknown.
So its up for Matoro to explore some mystery dungeons, meet new friends and master new abilities in order to find the source of the disease and save the world from a ancient evil.