Viktor can easily penetrate this front liner's shield, and his grenade has a big enough radius to damage anyone behind Barik's shield. Also, Barrage can easily be used as a flank Ultimate like Skye's, and can kill Barik's team if they are close.
Due to Bomb King's significant lack of ranged attacks and abilities, any sniper or long range champion like Cassie or Lian can counter him quite easily. Just make sure you block all side routes, because Bomb King can very easily sneak in.
Sha Lin's basic attack an Planted Ability easily shred through his shield, and allows Sha Lin to easily kill Fernando. Additionally, with Wrecker, his shots deal even more damage, which easily melts Fernando's shield like butter.