Uhm I guess then your best chance is to get a Bronzor and a Graveler on route 3 and train them...use them in your battle instead of Gothitelle and Banette/Blaziken since Roserade can take a hit from Altaria (I think) and Stun Spore it.
Using the Trick Room strategy should help you out, just spam Gyro Ball with Bronzong, Rock Slide/Blast with Golem and Heracross, then Moonblast that bulky piece of cotton that Altaria is.
EDIT: Oh shit the Gliscor :S Uhm I think you should also get a Beartic(?