Search for Majoron-emitting modes of $^{136}$Xe double beta decay in EXO-200

EXO-200 was a single phase liquid xenon Time Projection Chamber (TPC) detector located at  the Waste Isolation Pilot Plant. The experiment collected data taking in two phases between May 2011 and December 2018. EXO-200 demonstrated good energy resolution and excellent background discrimination in an ultra-low background TPC. A search for Majoron-emitting modes of the neutrinoless double-beta decay of $^{136}$Xe is performed with the full EXO-200 dataset. This dataset consists of a total $^{136}$Xe exposure of 234.1 kg$\cdot$yr, and includes data with detector upgrades that improved the energy threshold relative to previous searches. In this talk, we present the the analysis methods and results of searching for Majoron-emitting modes of $^{136}$Xe double beta decay with the complete EXO-200 dataset.