Administrative Litigation Act Article 52

In cases where there are two or more advocates, each advocate may represent the party independently.Retention in violation of the provision of the preceding Paragraph does not undermine the representation by the advocate independently.
中文原文 行政訴訟法第52條
訴訟代理人有二人以上者,均得單獨代理當事人。
違反前項之規定而為委任者,仍得單獨代理之。

English translation for reference only; the Chinese text prevails. Not legal advice.