Oblivion Wing

Oblivion Wing was a key member of Pokébellum before her defection after the Wrath Incident, as well as being the first (and only currently known) Grade X suit before said incident.

Backstory
Pokébellum, the group responsible for Mist Purge's creation, didn't stop at just one experiment, but after his escape, Project Grade X was pushed forward. The intent was to create a Herosuit which would take over the Host's body and mind, leaving them the perfect weapon for them to use. Thanks to the data recovered from Mist Purge's escape, the special synthetic Yveltal Ditto was programmed much better, and was fused with an unknown kidnapped woman, who would lose her identity and become a Yveltal, who calls herself Oblivion Wing. She was given one directive: to destroy anyone who would hinder the progress of Pokébellum, which especially included the escaped Mist Purge, and while she doesn't follow it to the letter, as she often makes threats towards some of Pokébellum's leaders, she is focused when on a mission.

This led to her 'defeat' by Land's Wrath, who absorbed her and converted her into a red-and-black Core Cell. She was almost captured like this, but she was able to escape, and thanks to the Grotto, she was able to regain a new suit form through the fact that she had corrupted one of the pods before her 'defeat' by Land's Wrath.

Powers
Oblivion Wing has some slight increase to her strength, but she is more infamous for the one move she knows so well that she can use it in creative ways, which she named herself after: Oblivion Wing. She can use it to cause random destruction if needed to draw someone out, but it is also useful to attack any Heroes who get in her way, damaging them while restoring some of her stamina.

Weaknesses
Oblivion Wing is not used to fighting groups, and despite her strength, she is less able to use it against those who attack her close up. Also, the huge integration does increase the energy the suit needs to take from their Host, and it isn't easy for her to get it when she really needs a top-up externally and there's no targets for her to Oblivion Wing to recover with. Finally, she's not that agile compared to most Heroes.