Ash and the gang visit a research lab to witness Professor Juniper and 
Professor Fennel revive an ancient Pokémon called Archen. They begin the
 revival process using Fennel's Musharna which wakes up Archen. However,
 it is restless and begins to attack everyone. Meanwhile Team Rocket 
decide to steal the Archen, along with the data for constructing a 
restoration machine. As Archen is sleeping, the professors are pondering
 what having an Archen in this modern world is like. As it wakes up, it 
starts to destroy the lab and its crying causes an ancient plant to 
start growing in the lab. It starts to search for food only to discover 
that Cilan's Pokémon food and the food growing in trees don't taste 
good. Archen decides that it wants to fly, only to find out it cannot. 
Ash and Iris offer to help it, however Iris' Emolga starts off by using 
Attract, which fails and only makes Archen poke at her. She responds by 
using Volt Switch and switches out with Cilan's Stunfisk. After a long 
stare between Archen and Stunfisk, it bites Stunfisk out of curiosity 
and Stunfisk responds by using Discharge on it. Archen cries loudly, 
once again, causing the plants to grow again. Archen continues to try to
 fly, eventually starting to become successful, all the while releasing 
its cries. Eventually the plants consume the lab and begin to grow the 
fruit that Archen likes. It eats them and evolves into Archeops and 
begins to fly. After Team Rocket steals the design of the restoration 
device, they decide to go capture Archeops. They destroy the plants and 
capture Archeops in an electrically charged net. Archeops retaliates, 
forcing Team Rocket to retreat. At sunset, a group of Archeops arrive 
and the revived Archeops joins the group. The professors and the gang 
depart from Archeops and each other as they continue to Nimbasa City. 
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