This study looks at using repetitive transcranial magnetic stimulation (rTMS) to help with Levodopa-Induced Dyskinesia (LID) in people with Parkinson's Disease (PD). LID are jerky movements that happen after taking medicine called levodopa. The study will focus on a part of the brain called the pre-supplementary motor area (pre-SMA) to see if rTMS can make these movements less severe or happen later. The study will also try different ways of sending magnetic pulses to find the best method. People taking part will be divided into groups to test two different pulse patterns. The effects will be measured using a special scale to see how well it works.

• Participants must have Parkinson's with LID and stable medication.
• Study involves comparing real and fake (sham) treatments.
• Excludes those with psychiatric disorders or on specific medications.