In Generation III, Grovyle was the first evolution of Hoenn's Grass starter Pokémon Treecko. It is a significant character in both Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness as well as Pokémon Mystery Dungeon.
Hes also willing to do anything to alter the dark future in which he lived, even if it meant dying himself or outright killing others, as he nearly killed Azelf and the partner when they stood between him and a Time Gear.
Dusknoir finally captures him, but before taking Grovyle back to the future, he takes the player and partner with him. There, Dusknoir has his Sableye attempt to execute the player, their partner, and Grovyle. Thanks to Grovyles quick thinking, they escape. The three find a Shiny Celebi, who Grovyle used to travel into the past in the first place, so the trio can return to the past. However, Dusknoir, his Sableye, and Dusknoirs master, Primal Dialga arrive to stop them.
Recovering the Time Gears was meant to stop Temporal Tower from collapsing, sending Dialga into a primal rage, and paralyzing the planet. Dusknoir, as opposed to stopping Grovyle from freezing time, had been sent back in time by Primal Dialga to ensure time would freeze. Grovyle, the player, and the partner recover the Time Gear of Treeshroud Forest, noticing that time had already stopped even with the Time Gear still in place.
He is then forced to send himself and Dusknoir back to the future, leaving the Time Gears with the player and partner. After time has been restored, he, as well as Dusknoir, the player, and Primal Dialga, become erased from time. However, in return for their bravery and for the heartbroken partner, the player is restored by Dialgas time-warping powers.Grovyle is a powerful and skilled warrior.
It is then that Grovyle learns that the player is in fact, the human partner he traveled back in time with.Back in the past, Grovyle reveals that he and the player (as a human) were trying to solve the mystery of the paralyzed planet. After traveling to the past, the player and Grovyle got separated, with the player losing memory and turning into a Pokémon, and Grovyle attempting to find the Time Gears.
Grovyle is shown to be rather innocent in nature, especially after he was attacked with Ice Shard by a group of three Snorunt over on Frozen Island as a prank, easily angering Grovyle; however, Dusknoir also pointed out how Grovyles innocence also shields him from being influenced by the futures darkness, indicating a strong will that exists within Grovyle. Grovyles strong will seems to be his main driving force in restoring the dark future to what it once was.
Grovyle seems to be very motivational to those around him, especially when he was able to get to Dusknoir, after recovering from battling four Glalie and a Mamoswine, changing his dark and evil ways, slowly allowing Dusknoir to redeem himself; the same thing could be said with the six Sableye when Grovyle motivates and persuades the Sableye to change their ways, as their changes of heart helped spare Dusknoir from Primal Dialgas wrath.
At first, Grovyle is believed to be a villain, supposedly trying to steal the Time Gears to cause the planets paralysis. The players team eventually confronts Grovyle, but despite their best efforts, they are defeated by him (while it is possible to defeat Grovyle in the battle, the cutscene is the same regardless). He nearly kills the players partner, but Dusknoir, a famous explorer from the future who is trying to stop Grovyle as well, chases him off.
Grovyle heads out alone to recover the other Gears, made easier by the Team revealing the truth about him and Dusknoir to everyone else. They head to the Hidden Land, which leads to Temporal Tower. However, they are confronted by Dusknoir. After finally defeating him and his Sableye, Dusknoir reveals to the player that if the mission is successful, all Pokémon from the future will be erased from history. Grovyle confirms this and intercepts an attack by Dusknoir meant for the player.