 If Sheninja was in Pokemon Scholar in Violet it would be the most broken Pokemon to have ever existed. With the ability Wundergarde it can only take damage from super effective attacks. And now with the new terastalising mechanic in Scholar in Violet, if Sheninja had the electric Terra type and held the item Air Balloon which gives you immunity to all ground type attacks, no attacking moves would be able to touch it, leaving the only options to knock it out from things like residual weather damage, leech seed, perish song and entry hazards.