Cool. Haven't gotten one in a while.
I have the next Pokemon in mind, but haven't put together the actual riddle yet. I'll edit this post when I do.
Edit: Here it is. Hopefully, it won't be as vague as some of the other ones I've done.
I am bound by the forces of the universe.
I am not made of nature, yet I am lured by a natural occurrence.
I am tolerant of the elements above all, yet I was not originally so.
I was made stronger by companionship, yet I will gain my highest strength by becoming alone again.
I am many, yet I am one.
Who am I?