The best moveset for Beartic in the current competitive meta typically features the moves Icicle Crash, Protect, Close Combat, Liquidation.
In the Pokémon Champions meta, Beartic can be countered by exploiting its weaknesses (fighting 2x, fire 2x, rock 2x, steel 2x) and using effective check/counter teams.
The best item for Beartic is typically Never-Melt Ice, based on high-level tournament and ladder stats.