I got an essence of kelpari and I wanted to get a kelpari with butterfly fairy wings but every time I try to generate it says "pick a valid mutation for M2". What does this mean?
(The wings are in M2)

Butterfly Fairy Wings are a restricted trait (should appear in red text on the dropdowns, but they don't seem to do it for all computers or devices) which means they cannot be generated.
The only way to get Butterfly Fairy Wings on a Kelpari is for it to be decended from the themes that have it

List of Restricted Traits (that we're yanking from a post we made a bit back on another FAQ and updating)

Restricted traits found on all pets:
Valentine Lace (Festival of Love, Febuary)
Lucky Dust (Fortune Festival, March)
(these are traits that could be generated, if the pet in question was made during the respective Festival)

Species Specific Restricted Traits ('Majestic' traits):
Aeridini:
- Lunar
Themes: Spring Moon Aeridini, Autumn Moon Aeridini

Aurleon:
- Tempest
Themes: Tempest Winds Aurleon, Happy Winds Aurleon
- Ghostly
Themes: Ghostly

Draeyl:
- Travelling Witch
Themes: Traveling Witch

Griffi:
- Majestic Peacock
Themes: Majestic Peacock, Imperial Peacock, Ember Peacock
- Galactic
Themes: Galactic, Guardian Angel

Kelpari:
- Butterfly Fairy
Themes: Butterfly Fairy, Ice Fairy
- Reaper's
Themes: Reaper

Luffox:
- Windchaser's
Themes: Windchaser, Leaf Chaser
- Foo Dog
Themes: Foo Dog, Arctic Foo Dog

Morkko:
- Mystic Witch
Themes: Ghost Fire

Ny'vene:
- Spectral
Themes: Spectral

Qitari:
- Sugar Plum
Themes: Sugar Plum

Ryori:
- Grim Rose
Themes: Grim Rose

Sylvorpa:
- Nereid
Themes: Ocean's Jewel, Frosty Depths

Vulnyx:
- Ethereal
Themes: Spring Druid, Ethereal
- Arctic Nomad
Themes: Arctic Nomad

Zolnixi:
- Dragon Wisp
Themes: Emperor's Dragon, Wooden Twilight
- Cute Witch
Themes: Cute Witch


As said, breeding is pretty much the only way to get the traits outside of creating the pet via the specific creation method of the release period.
There may be another Wheel of Themed- which was a random chance of getting any one of Majestic themes on the Wheel- at some point, though it seems rather unlikely.

Ah I see

Thanks for the help!

if you look for a Butterfly Fairy Wings pet, look in the advenced shearch. Some are sold to a relatively low price and for the colors you still can dye it later ^-^