Jiggly has been with Green since childhood, when she was a Jigglypuff. She was one of two Pokémon Green was known to have while she lived with the Masked Man. Jiggly would eventually help Green and Silver escape from the Masked Man, allowing them to start a new life.
Jiggly, as Jigglypuff, first appeared in Tauros the Tyrant carrying Green and Red away from a group of Team Rocket Grunts who had come to retrieve the disc on the phantom Pokémon, Mew, which she stole from them earlier. After neither side succeeded in capturing Mew, and it had seemed Green had come to her senses and handed Red the Badges she stole, she was seen again taking flight for her as she said goodbye. However, as it turned out, the tricky girl had deceived Red again and gave him fake copies, which she would not reveal until the Silph Co. incident.
In Just a Spearow Carrier, during the fight against Dr. O in the semifinals of the Pokémon League, Jiggly was the first Pokémon sent out against his Spearow, where Green conceitedly pronounced her "win" after hitting it with a Tri Attack; but it would strike right back with a Fury Attack. In retaliation, Jiggly used Sing, but the bird Pokémon was simply too high up for her attack to reach, and would deftly avoid the Tri-Attacks Jiggly used. Green then switched to Blasty and used an aerial Hydro Pump, but eventually lost to Spearow's Mirror Move. Afterwards, Oak questioned her for her theft of the former Squirtle, and after accepting her apology, handed her the third copy of the Pokédex.
In The Final Battle VII, Jiggly appeared alongside the rest of Green's team when she was checking to make sure they all survived the petrification caused by Mewtwo and Darkrai.
Personality and characteristics
As Jiggly is the first Pokémon Green ever acquired, she is a fairly strong battler, but is more often seen transporting Green around by inflating herself, as before the Gold, Silver & Crystal chapter, Green was intensely afraid of birds. Her ability to swell like hot air balloons came in handy during Green's escape with Silver when she pretended to be a wall the two hid in as though it was a dead end. Jiggly is a very relaxed and docile Pokémon and tends to adapt well to whatever is going on around her.