Anionic polymerization of a non-conjugated polar alkene, allyl methacrylate (AMA) was initiated by tert-BuLi (t-BuLi) in toluene at −20 °C for 2 h in the presence of a bulky aluminum Lewis acid, methylaluminum bis(2,6-di-tert-butyl-4-methylphenoxide) (MAD). Quantitative monomer consumption was confirmed and >99% of the expected poly(AMA) was obtained after reprecipitation using chloroform and methanol as good and poor solvents, respectively [Mn of 12.2 × 103 -21.6 × 103with a molecular dispersity index (Mw/Mn = 1.70-1.83)]. A thiol-ene click reaction of the pendent ally groups with 1-butanethiol and subsequent Oxone-oxidation gave the poly(AMA) with pendent ternary units of sulfone, sulfoxide, and sulfide [Mn of 11.3 × 103 -26.0 × 103 with a molecular dispersity index (Mw/Mn = 1.43-1.79)]. Electrophoretic deposition (EPD) was performed as detailed in our previous report dealing with electrophoretic sulfone-containing non-ionic polymers, using a dispersion consisting of tetrahydrofuran (THF) and methanol (1/50, v/v). As we expected, the obtained poly(AMA) derivatives were deposited on an iron plate. However, 1H NMR results surprisingly supported the simultaneous reduction of the pendent sulfone to sulfide after the deposition, which indicated that anodic reduction of sulfone-containing electrophoretic polymer had been demonstrated without the need for expensive commercially available reagents.