Antiskyrmions (ASks) exhibit an electrically tunable antiskyrmion Hall effect, enabling zero-Hall-angle propagation compared to skyrmions. However, the fundamental mechanism governing ASks formation in two-dimensional systems is rarely explored. Here, we demonstrate that the ${MX}_2$ (${\mathrm{NbO}}_2, {\mathrm{NbS}}_2, {\mathrm{NbSe}}_2, {\mathrm{MoS}}_2$, and ${\mathrm{MoSe}}_2$) monolayers with $D_{2d}$ symmetry host an intrinsic sizable anisotropic Dzyaloshinskii-Moriya interaction (DMI) enabling ASks stabilization. Crucially, in 2D ${\mathrm{MoS}}_2$, biaxial strain dramatically tunes the anisotropic DMI strength ($|d_{\parallel }|/J_1=0.07–0.16$) and the magnetic frustration ratio ($|J_2|/J_1=0.18–0.5$), cooperatively driving sequential magnetic phase transitions from an antiskyrmion lattice to an ASks-wormlike-domain mixture and ultimately to distorted spin spiral states. A comprehensive investigation of magnetic parameters further reveals that frustration reduces the critical DMI threshold for ASks formation by 70% compared to frustration-free systems while minimizing the antiskyrmion diameter to sub-2 nm, greatly expanding their stability window. This study elucidates the fundamental mechanisms and provides valuable information for achieving multichiral topological spin configurations in low-dimensional magnets.

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• Dzyaloshinskii-Moriya interaction
• Skyrmions
• First-principles calculations