Shellshock

John's Wartortle, nicknamed Shellshock, is the sixth Pokemon obtained by John in the Sinnoh region. He was given to John as a gift from the warden of the Great Marsh for rescuing a stranded Drifloon. Squirtle was initially very frail and weak, but upon his evolution into Wartortle, he became a headstrong and powerful Pokemon.

History
Squirtle was given to John as a gift for rescuing a stranded Drifloon. It was very shy and frail, often losing battles upon taking its first hit, no matter how pumped up it could be for a battle, it would almost always lose.

During an attack by a wild Elekid, Squirtle stepped up his game to protect his trainer and evolved into Wartortle. He defeated Elekid, despite the type disadvantage after evolving, showing off its strength. After evolution, Wartortle displayed a cocky and headstrong personality. He's a bit dim-witted, but very powerful in battle.

He became a valuable asset to John's team upon evolving and has won many battles. He is John's star Pokemon against Elite 4 member Bertha, easily defeating her.

After the league battles, John decided to start off in a new region with a clean slate. So he left Shellshock, alonside his other party Pokemon, at his home in Twinleaf Town before setting off with his baby Mijumaru, nicknamed Blue Moon, to the Isshu region with his friends.