#aschenputtel

Mimikyu

Trevenant

I chose Mimikyu because it's a lonely Pokémon that wears rags in order to be more loved.

It wears a rag fashioned into a Pikachu costume in an effort to look less scary. Unfortunately, the costume only makes it creepier.

This fits with how Cinderella is forced to wear rags by her family and only wants to be loved.

They took her beautiful clothes away from her, dressed her in an old gray smock, and gave her wooden shoes. "Just look at the proud princess! How decked out she is!" they shouted and laughed as they led her into the kitchen.

This is a huge stretch but both have also worn "disguises" in order to be loved by others (Mimikyu with the Pikachu costume, Cinderella with her ball gown). I think they'd get long pretty well.

Remember when I said that there were other details I was saving later on? Well, there is no fairy godmother here. Instead, the Brothers Grimm have a tree that is planted on the mother's grave take on that role.

Cinderella thanked him, went to her mother's grave, and planted the branch on it, and she wept so much that her tears fell upon it and watered it. It grew and became a beautiful tree.

I figured Trevenant would fit well here as it's literally a ghost tree.

This Pokémon is said to devour anyone daring to ravage the forest. To the creatures dwelling in the forest, it offers great kindness.

Bonus points if it's female, like how some people interpret the tree to be the mother's spirit helping her daughter out.

Sensu Style Oricorio

Honestly, this was a really difficult decision between this and Decidueye, and I could definitely see an argument for the latter over the former. Both are ghost type birds, which reflects how Cinderella was also assisted by birds in the Brothers Grimm version.

Cinderella went to this tree three times every day, and beneath it she wept and prayed. A white bird came to the tree every time, and whenever she expressed a wish, the bird would throw down to her what she had wished for.

However, I went with Sensu Style Oricorio because not only is it said to curse its enemies (paralleling how Cinderella's birds peck out the eyes of the Stepsisters)...

It summons the dead with its dreamy dancing. From their malice, it draws power with which to curse its enemies.

...But it's shiny is more white, and the bird which is found at the tree at the mother's grave is described as white at one point.

Chandelure

Of course, you can't have a Cinderella story without a ball or festival for Cinderella to meet her prince in. And I figured that Chandelure would be a great Pokémon to represent the ball itself, considering that there are often chandeliers in fancy places where grand balls are set.

Gholdengo

At first glance, Gholdengo seems like a random Pokémon to associate with Cinderella. But you have to remember: The Brothers Grimm Cinderella's slippers aren't glass like in the more famous Perrault version...they're gold.

This time the bird threw down to her a dress that was more splendid and magnificent than any she had yet had, and the slippers were of pure gold. When she arrived at the festival in this dress, everyone was so astonished that they did not know what to say.

Considering Cinderella's dress is also gold and silver, I figured this would be a good fit.

Ceruledge

The reason I chose Ceruledge was simple: it seemed to fit well for Cinderella's prince, as according to Pokédex entries it'll do whatever it takes to reach it's goal and make it's trainer happy, not to mention the obvious "Knight in shining armor" parallel (even if Ceruledge is a darker take on this concept than, say, Armarouge).

The fiery blades on its arms burn fiercely with the lingering resentment of a sword wielder who fell before accomplishing their goal.

It swears loyalty to its Trainer. Should anyone dare to show that Trainer hostility, Ceruledge will cut the offender down without a second thought.