Florges is correct! frogofdoom555 got it.
Explanation:
I keep watch from my castle warm, - a reference to florges’s Y pokedex entry, which states that governors of castles would invite them to create flower gardens. Also a reference to the Shabboneau Castle and Parfum Palace, both in Kalos and both around an area where you can find flabébé.
But what do your eyes see? – looks like a grass type to me… her name, design, abilities, pokedex entries, and moveset all point to her being a grass-type.
For beauty comes in many forms: - a reference to her female-only status, her name which has the word “gorgeous” in it, and of course the fact that florges comes in five different forms.
I am not what I appear to be – she isn’t a grass type after all! Pure fairy-type instead.
We are ruled by the demons who daunt, - referring to dragon-types, which used to rule the metagame. You could also interpret “demons” to be “dark-types” to be more literal, as fairy is super effective against dark.
But there is no need to raise alarm, - Fairy is immune to dragon and is also super effective against it.
Ne t'inquiète pas mon enfant, - “don’t you worry child” – worded in a way that would imply a close relationship. This refers to Flabébé, as half of her name is French and she was introduced in Kalos, which was based off of France.
“Enfant” (“Child”) references the fact that flabébé’s name includes
“bébé” (“baby”), and is the first-stage in the evolutionary line (also, “enfant” is phonemically similar to the English “infant”).
I will shield you from all harm – referring to flower veil, florges’s usefulness as a special wall, and her dragon-type immunity.
Good job, you can make the next riddle frogofdoom555.
EDIT:
So, uh, anybody else wanna make the riddle because I don't think the user who answered correctly is going to do it. xD