Grovyle is a major character in Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness and Pokémon Mystery Dungeon: Explorers of Sky. Grovyle and the player both came back from the future to stop time from freezing and the planet's paralysis. Early in the game, Grovyle is discovered to be stealing the Time Gears, and is labeled as a criminal. But later in the game, the player and their partner team up with Grovyle to stop Temporal Tower's collapse. So yeah. Go for a voice that sounds like Bakugo from My Hero Academia or something similar. Or go for the voice that Dan Green did in the Mystery Dungeon anime.