* Level Cap: The game has a hard level cap of 50 for all Pokémon. This is a design choice by the developers, and there's no way to bypass it using in-game methods.
* Trading: Even trading Pokémon from other games won't change their level if they're already level 50. The level cap applies to all Pokémon in the game, regardless of their origin.
However, there are a few things you can do to make your Pokémon strong even at level 50:
* Maximize IVs: IVs (Individual Values) are hidden stats that influence a Pokémon's base stats. You can use the "Secret Base" feature to find Pokémon with better IVs and breed them to get even stronger offspring.
* Optimal EVs: EVs (Effort Values) are earned through battling, and they also influence your Pokémon's stats. You can train your Pokémon in specific ways to gain EVs in desired stats. You can use items like "Rare Candy" to boost your EVs.
* Good Moveset: Make sure your Pokémon learn the best moves for their role in your team. This includes considering their type matchups, and learning powerful moves for their type.
* Train Hard: While you can't level up past 50, you can still gain EVs by battling. Focus on battling Pokémon that give the most EVs for the stats you want to maximize.
Remember: Even though you can't level up past 50, you can still build incredibly powerful and competitive teams in Pokémon XD: Gale of Darkness by maximizing your Pokémon's potential through IVs, EVs, and a well-planned moveset.