For Offensive Power:
* Grovyle: Its high Attack stat and access to powerful moves like Leaf Blade and Aerial Ace make it a formidable attacker, complementing Riolu's physical prowess.
* Squirtle: While its Attack stat isn't as high, Squirtle boasts excellent Special Attack and access to strong Water-type moves like Hydro Pump and Ice Beam. This provides a good coverage for Riolu's Fighting-type moves.
* Turtwig: Similar to Squirtle, Turtwig offers strong Special Attack and access to various moves like Razor Leaf and Energy Ball, providing good type coverage.
For Support:
* Piplup: Piplup's access to support moves like Protect and Ice Shard makes it a valuable asset in battles, especially for its ability to stall and protect Riolu.
* Chimchar: Chimchar can learn moves like Quick Attack and Flame Wheel, which can be useful for speed and dealing damage.
Other Considerations:
* Type Coverage: Choose partners that cover Riolu's weaknesses (Flying, Psychic, and Fairy types).
* Move Synergy: Consider partners that learn moves that complement Riolu's attacks, such as moves that can weaken opponents' defenses or inflict status conditions.
* Playstyle: If you prefer a more aggressive approach, choose partners with high Attack or Special Attack stats. If you prefer a more supportive role, choose partners with strong support moves.
Ultimately, the best partner for Riolu is the one that best suits your playstyle and team composition. Experiment with different partners to find the one that works best for you.