If you want to make a thread about team advice, it's better to do it in the Team Showcase Forum.
Now for the team, honestly most of the pokemon in your team are pretty weak. Every single one of them is outclassed by other pokemon that are available at this point in the game. I'd recommend a total overhaul of the team, because as the game continues to progress it will continue to grow weaker and weaker.
Fire types: Arcanine, Ninetales, Darmanitan, Chandelure and Volcarona are great choices.
Psychic types: Alakazam, Gardevoir, Metagross, Reuniclus
Ground types: Nidoking, Nidoqueen, Mamoswine, Flygon and Excadrill (post Ciel)
Water types: Azumarill, Crawdaunt, Rotom-W, Milotic, and post Ciel there's Tentacruel and Starmie
Ice types: Mamoswine and Weavile (post Ciel)
Steel types: Magnezone, Forretress, Metagross, Lucario, Bisharp
Bug types: Volcarona, Heracross, Forretress, Scolipede, Galvantula
Fighting: Lucario, Heracross, Toxicroak, Scrafty, Mienshao
I could go on but I think you get the point. You need to start using some of the stronger pokemon otherwise you'll start having a lot of trouble with future battles. I may be coming off aggressive here suggesting you to change every member, but you will only encounter more problems as you go on. It's better to overhaul the team now than later. I know that you want to use your favorites, and I do encourage you to try to find the mons that best suit your play style. But in a game as hard as Reborn, a team with only average to weak pokemon won't cut it. So I do encourage you to at least try using the stronger pokemon.
As for Ciel specifically, you're having trouble with her because the only pokemon that is good against flying types in your team is Dewgong. And without it your team is pretty much helpless against her. Try adding a powerful Electric, Ice or Rock type. Some good mons are Magnezone, Mamoswine, Rotom-W (or Frost), Archeops, and Galvantula.