Changelings are evil, yet the only creatures in all of Equestria known to be able to change and look like other creatures... I wonder if it would be wise for my main OC's pony-self to be such a species since she can change her appearance similar to a Changeling as her normal self, yet isn't evil in the slightest... But at the same time back in her world she is thought to be evil when in fact she is the hero... Oh I'm so confused now that I've started to ponder this!

Plenty of Bronies have non-evil changeling ponsonas. I say go for it. :D

You really think there's enough room for 'another queen', so-to-speek? (My OC's position in her own world is more huge then that, but it's the highest athority possible, anyways, a Mew needs a disguise fitting of itself and it's status, so Changeling Queen it is for the omnipotent of the alternate pokemon reality! Now for her friends... Eh, I'll just make the other five unicorns, though some will hate being unable to fly anymore. Their first quest in the Equestria they land in, well... no more cupcakes is all I will say about it! )

lol, why not? Who's to say there aren't more hives anyway? XD
Sounds like you're going to have fun!

She's gon through worse conflicts with the help of her five friends. (both external and internal, considering the situation was basically having to kill the one she used to treat as a son after he was corrupted by Missingno which was beaten prior. The aforementioned son being an arceus and also currently in possession of half her stolen omnipotent power at the time. An insain party pony is nothing, and neither should delving into said pony's mindscape to eliminate the evil trapping the good within. BY THE POWER OF FRIENDSHIP, I DECLARE THAT PINKAMENA'S RAMPAGES WILL BE PUT TO AN END ONCE AND FOR ALL!!! And afterwards, it'll be time for a trip to a certain factory for their second mission. Basically, they'll be targeting an insane incarnation of each mane 6 member and try to end their evils one-by-one starting with the most infamous as already mentioned)