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With the rapidly expanded field of two-dimensional(2D) magnetic materials,the frustrated magnetic skyrmions are attracting growing interest recently.Here, based on hexagonal close-packed (HCP) lattice of $J_1$-$J_2$ Heisenbergspins model, we systematically investigate the frustrated skyrmions and phasetransition by micromagnetic simulations and first-principles calculations. Theresults show that four spin phases of antiferromagnetic, labyrinth domain,skyrmion and ferromagnetic textures are determined by the identified ranges of$J_1$-$J_2$. Importantly, skyrmion phase with an increasing topological number($Q$) covers a wider $J_1$-$J_2$ area. Then, the diameter of skyrmions can betuned by the frustration strength ($|J_2/J_1|$) or external magnetic field.Besides, a phase transition from N$\acute{e}$el to Bloch type skyrmion isobserved due to the change of the helicity with the variation of $|J_2/J_1|$.Furthermore, as increasing magnetic field, the skyrmions with high $Q$ ($\ge3$) tend to split into the ones with $Q=1$, thereby achieving a lowersystematic energy. Additionally, we find that the CoCl$_2$ monolayer satisfiesthe requirement of the frustrated $J_1$-$J_2$ magnet, and the related magneticbehaviors agree with the above conclusions. The frustration-induced skyrmionsare stable without the manipulation of temperature and magnetic field. Ourresults may open a possible way toward spintronic applications based onHigh-topological-number and nanoscale topological spin textures of skyrmions.

High-topological-number skyrmions and phase transition in two-dimensional frustrated $J_1$-$J_2$ magnets