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Haven't used Riolu, but Reversal is actually useful in PMD and Screech is good for linking.
Shinx eventually gets Discharge which is nice and has two alright abilities. Note that all Pokémon on odd floors are male and even floors are female. Linking Charge and Electric moves is good too.
Turtwig gets draining moves which are fun, can also buff with Withdraw for a bit more bulk. Would probably be more effective as a leader.
Though of course it's still a Pokémon game so you'll be fine with whatever.
Have fun OP, and here's hoping for a new PMD on Monday.
