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Pros
Pro It's POKEMON!
It's an actually decent system built around catching and training Pokemon. You can explore applications of a Pokemon's abilities even outside of combat.
Cons
Con More people = slower combat
Since each character and each character's individual Pokemon each get a turn, it takes forever as you wait for each to calculate their move's outcomes. This becomes a problem with a lot of people, but if you keep the group small (like 2-4 people, 5-6 maybe) you'll be okay.