"Pokémon Ranger: Guardian Signs" is an anime series that expands on the narrative of the Pokémon Ranger games, focusing on the adventures of a Pokémon Ranger and their partner Pokémon. The story is set in the Oblivia region, a remote archipelago where ancient ruins and mysterious artifacts hold significant importance. The protagonist, a young Pokémon Ranger, is tasked with protecting the region's Pokémon and maintaining balance between humans and nature.

The central plot revolves around the discovery of ancient relics known as Guardian Signs, which are tied to the legendary Pokémon Latios and Latias. These relics are sought after by the Pokémon Pinchers, a villainous group aiming to exploit their power for selfish purposes. The Pokémon Pinchers, led by the enigmatic Phantom, disrupt the peace of Oblivia by capturing Pokémon and attempting to control the Guardian Signs. The protagonist, alongside their partner Pokémon and allies, must thwart the Pinchers' plans and uncover the true purpose of the Guardian Signs.

Throughout the series, the protagonist forms bonds with various Pokémon, utilizing their Capture Styler to befriend and enlist their help in solving puzzles, battling enemies, and navigating the region's diverse environments. The narrative emphasizes themes of cooperation, trust, and the importance of preserving the natural world. Key characters include the protagonist's mentor, a seasoned Ranger who provides guidance, and a rival Ranger who occasionally assists in critical missions.

The story progresses through a series of missions and challenges, culminating in a confrontation with the Pokémon Pinchers and the revelation of the Guardian Signs' connection to the legendary Pokémon. The climax involves a battle to prevent the misuse of the relics and restore harmony to Oblivia. The series concludes with the protagonist reaffirming their commitment to protecting Pokémon and the region, leaving the door open for future adventures.