Please do check out the Reading List by Lance Omikron to navigate the Amalgam Universe most clearly

A massive war of titanic forces is taking place in the Kaiju's world. However, when two faction's leaders, the current Godzilla and his 'brother' Xenilla duke it out; humanity unleashes its most devastating weapon. Something beyond comprehension occurred and the boundary that divides worlds, if only for the briefest of moments, was torn to shreds. New forms are taken, new bodies assumed. But old hatreds die hard. But how well can hatreds continue in the world of love and tolerance? Especially with its own demons follow it there?

Godzilla Franchise by Toho Company Ltd.
My Little Pony is owned by Hasbro Studios.
This is a non profit fan-work and I claim no ownership on the IP itself.
Story created by Tarbtano
Co-created and Contributed by Faith-Wolff and Skylark8756

HOLY SHEETZU WE GOT FEATURED! THANKS GUYS!
6/27/2014
Now on TV tropes (Thanks Raidrik, VampyGirl; Lance Omikron, Ultimomant, and ZimFan!)

Kaiju Cast:

Godzilla a.k.a Gojira
Xenilla
Mothra
Anguirus
Rodan
Destroyah

[Character copyright of Toho and Daiei Company, artwork property of Matt Frank]

(for any G-fans, Xenilla is the kaiju you may know as Spacegodzilla. I changed the name because I got quirked about typing it repeatedly and am writing the story so it can at least be understood by just an MLP or just a G-fan; and thought it get very confusing that one character's name was just another character's name with an adjective. Also... don't pretend it's the most imaginative name Toho has every made)

There exists a desolate land where nothing survives for long on the surface. Life can only exist below the surface, where thousands of years ago, creatures known as procubi have created thriving civilizations. Those with horns lead those without; those with wings guard and fight for those without; those without either serve those with; and all are under the command of those with both.

Four matriarchs lead the Femescubi, creatures of beauty, grace, and machinations. One patriarch leads the Mascubi, creatures of strength, power, and wit. Conflict had driven the two apart long ago, yet they still convene together regularly before returning to their respective abodes. Past and present conflicts within each trouble the balance they've developed, threatening their way of life for better or for worse.

Image is by Audrarius on inkbunny.net. Sex tag for brief nudity and sensuous outfits.

Some time has passed since the end of the Friendship Games, and Twilight Sparkle is still adjusting, but it's nothing that Sunset can't help her with. However, something seems off when Twilight starts to have dreams. Dreams of a library with infinite books, and of a masked warrior who fought against monsters.

It is soon revealed that these were not dreams but premonitions, the power of the Earth has give birth to the creations known as Gaia Memories, and in order stop those who would use their power to hurt others, Sunset and Twilight will have to work together to stop it. With knowledge in hand, Twilight will equip Sunset with the tools needed to fight this menace, Sunset Shimmer will become Kamen Rider Unicorn!

"Time to restore harmony!"

< UNICORN! >

This is a crossover of the Japanese Tokukatsu type TV series, Kamen Rider W

Apparently it has a TV Tropes page, go figure. Thanks whoever did it!

New cover art is fan art from pyropyre

And here's the theme song, Brave Phoenix

Made this to help with reading: Kamen Rider Unicorn Reading Order

The wheel of time turns, as destiny and history clash together.

Fifty years into the future, Sunset Shimmer is Princess Twilight Sparkle's most faithful student. She is smart and eager, but doesn't always think things through. Her life had been perfect, right up to the End of the World.

With a ruined future, Sunset travels into the past to alter the course of history. With only her mentor's cryptic word to go on, Sunset and the Elements of Harmony must solve the riddle of the Dark Regalia and stop the mysterious Vesper Radiance from rising to power. But the further Sunset goes, the more she feels like she's been through it all before.

Is destiny set in stone, or can Sunset shape her own future? Only time will tell.

Featured on Equestria Daily 6/16/13
Gratefully edited by JustAnotherTimeLord, Icarus_Gizmo, Cerulean Voice and Bad_Seed_72

The Sunset of Tropes page!

For a thousand years, the continent of Equus, divided between the kingdoms of unicorns, pegasi, and earth ponies, has existed in relative harmony. Within the enchanted land of Lumen, Twilight Sparkle has become the newest member of Class Zero, the kingdom’s best and brightest students.

A series of disastrous events leads to the threat of an all-out war between the races with Class Zero at its heart. And with the conflict comes a bitter chill not even the sun can warm. Twilight and her new friends will have to give it their all to defend not just their land, but the entire world.

But it'll take more than just unicorns to stop the coming storm. Because if the three kingdoms can't work together to find harmony, there may not be a home left to fight for...

Amazing cover art by Multiversecruise!
Gloriously edited by Novel Idea, DrakeyC, Cyrano, and Corejo!
Featured on Equestria Daily