Pokémon : S5 | E49 – Hatch Me If You Can

While Ash and his friends stop for lunch, they are particularly keen to find out what Pokémon will hatch from the Pokémon Egg. Just as Brock suggests it's going to be a Legendary Pokémon, the Egg begins to glow inside its Egg case as if it is about to hatch, but it's only a false alarm. As Ash tries to persuade the Egg to hatch by tucking it under his shirt and singing, Team Rocket spies on them from the bushes and then begins to scheme how to get it. At that moment, the Egg begins to glow again from under Ash's shirt. When Ash pulls his shirt up, it reveals a sleeping Larvitar. Ash checks his Pokédex for more information, and while he is disappointed to learn that it isn't Legendary, he admits that it was cool to see it hatch. Misty notices that Larvitar isn't moving terribly much, and Brock checks its temperature to discover that its body temperature is way too low. The trio decides it's best if they get Larvitar to a Pokémon Center, and promptly go to a nearby one.

Nurse Joy can't find anything wrong with Larvitar so she decides to call Professor Elm to alert him to the situation. However, Elm fails to reply because he is busy hosting Professor Oak and Delia, who have traveled to New Bark Town so they can see Ash off to the Silver Conference. Trouble is brewing back at the Pokémon Center: not only can Nurse Joy not get a hold of Professor Elm, but a storm is brewing and Larvitar isn't getting any better. As Nurse Joy finds that Larvitar is getting worse, the power goes out. Nurse Joy goes to check on the generator but falls down one of Team Rocket's pitfalls. Jessie explains to her that they were the ones who damaged the generator and now they're going to kidnap Larvitar. Inside, Ash and his friends wonder where Nurse Joy is. Jessie, dressed up as Nurse Joy, and James, disguised as a surgeon, tell them that they need to take Larvitar to the hospital. Ash almost complies, but Brock stops him and tells him that it's clearly not Nurse Joy. Brock explains that Nurse Joy usually has a sweet-sounding voice and doesn't smell like dirt. Jessie is immediately insulted and takes off her face mask to reveal herself. Meowth smacks Jessie with a paper fan for blowing their cover. James tries to take Larvitar by force, but he only pulls off its warm blanket. Ash orders Pikachu to use Thunderbolt, sending Team Rocket running off. Misty and Brock go rescue Nurse Joy from the pitfall, but Nurse Joy explains that the generator's blown beyond repair. Inside, Ash uses Cyndaquil to heat Larvitar with the flame on its back.
(Source: Bulbapedia)