Diamond's Aura flared up again and he wasted no time in charging the Slurpuff by himself, aiming to simply kick it out of the way with great force. Nothing special about the kick unless one counted the enhanced strength and speed granted by the Aura around him, but even then it likely wasn't much. Whether or not his attack landed or did anything, Lucy would step forward, a Bone-Rush appearing between her paws. Tears streamed don her cheeks and she gripped the staff of bone tightly to the point where it cracked under the pressure, before charging her former master.
She didn't strike to hurt him, but to get him away from the Slurpuff, quickly hopping back when her diversionary strike worked, and he hopped back a good dozen feet, tossing out a pokeball in the meantime. "Torterra." he called.
Sure enough, Diamond's Torterra slammed it's feet into the ground as it was called out of his pokeball. It, like Lucy, was not corrupted, but it was not as intelligent as its Lucario counterpart, and though there was a struggle beneath its determined eyes, it would follow it's master's orders. Lucy, in poke-speak, pleaded with it to turn on Diamond with her, to help save him from this corruption.
Her words would be drowned out. "Frenzy Plant." Torterra raised up on its hind legs, and then slammed down his front ones. Sure enough, the vines exploded from the ground, attacking not just the pokemon at hand, but also the trainers, while Diamond hopped onto the shell of his massive Torterra, and gained his balance, pressing his palms together, and focusing his Aura.