As long as Ursaring is your Active Pokémon, your opponent's Basic Pokémon can't attack or use any Poké-Powers.

Drag Off

20

Before doing damage, you may switch 1 of your opponent's Benched Pokémon with the Defending Pokémon. If you do, this attack does 20 damage to the new Defending Pokémon. Your opponent chooses the Defending Pokémon to switch.

Rock Smash

40+

Flip a coin. If heads, this attack does 40 damage plus 20 more damage.