Answer:
Shelmet evolves into Accelgor, and Karrablast evolves into Escavalier. Both Pokémon can only evolve when they are traded for one another. This can be through Link Trade or Surprise Trade, though the chances of the latter are significantly lower.
Step-by-step explanation:
Not really a fan pf Pokémon but I do like Pikachu every other Pokémon is annoying but yah hope that helps