Swellow is beloved by mainline Pokemon trainers ... two of those being full immunity from Poison and Ground moves. You don't want to underestimate Steel-type Pokemon, and you certainly won ...

Shadow Swellow has no viability in the PvE ... Plus, it is not even a good Poison-type attacker to take down Pokemon at Gyms. Shadow Emboar is a Fire- and Fighting-type Pokemon.

Bulbasaur as it appears in the anime (Image via The Pokemon Company) Bulbasaur is Ash's third catch, and this starter grass & poison-type ... multiple Thunderbolts. Swellow later lost to Pikachu ...