In the Kanto region of the world, there lies a small, unimpressive forest that is only several miles away from Pallet Town. No greed-driven company has sought to deforest this land for either timber or even space to build a new shopping mart. There wasn't even as much as rumors of ghost stories that could be associated with this forest. In fact, no significant history could be associated with this nameless forest.

Unless you're Professor Oak.

Professor Oak has dedicated many years to studying the rare Celebi. While he is one of the leading experts on this elusive Pokemon, he has been quiet about his suspicions about Celebi's connection with the forest, which he has privately named Celebi's Forest. Long ago, Pallet Town was home to an alarmingly large amount of unknown visitors. They posed no threat, but the fact that they had seemed to have no knowledge of even the most basic information of the Kanto region, the police force became suspicious. They launched an investigation to determine where these people came from, but they were unable to turn up any leads. With nowhere else to turn to, the police consulted the local Pokemon Professor, Oak, to see if perhaps an unknown Pokemon's power was perhaps the cause behind these strange people's appearances.

The professor's own investigation turned nothing up, as well, but soon the people vanished from the small town and there were no more unexplained visitors. The police decided to drop the case, but Oak's curiosity remained. Through investigation, he learned that visitors could not have come from the neighboring Pewter City. One day, he stumbled across Celebi's Forest and thought to himself that this place, while small, could be a great hiding place. Naturally, he found nothing in the forest after many hours of searching, so he decided to leave the case alone.

However, in the near future, he had started more studies on Celebi. In his readings, he stumbled upon an old legend. In Kanto, there was once this leader of a powerful and unidentified tyrant. Not much is known about the tyrant except that he attempted to extend his power all throughout Kanto. A group of powerful rebels fought the tyrant with, armed with nothing but their Pokemon. It was believed that Celebi watched over the brave warriors and protected them. It was also believed that Celebi provided the rebels with a base of operations impossible to be found by outsiders. This secret base provided the rebels with a large enough advantage to eventually bring the tyrant to his knees and banquish his influence in Kanto. The rebels then disappeared after accomplishing this feat, and some experts believe that they resided in the secret base.

Professor Oak's own studies of Celebi suggested that the last time Celebi had been seen in the Kanto region was in the vicinity of Pallet Town, which is the reason he decided to take residence in the small town. After reading the legend, he was convinced that Celebi's Forest was the location of the rebel's secret base and dwelling. Obviously, he never made this claim public since he lacked any kind of proof. This turned out to be beneficial to his credibility, because his theory was incorrect:

The forest's secret inhabitants to not refer to it as Celebi's Forest; they call it Itanelf.