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Remember when people were all like "Oh man its going to be fire/psychic, water/fighting and grass/dark"?
Now that we know their second evolutions, I'm thinking the opposite: fire/psychic, water/DARK and grass/FIGHTING. That way each type is completely super effective against it's rival.
You want evidence? Ok.
The Chespin's evolution is definitely sometype of bulky knight and what do knights do? FIGHT!
Froakie's evolution is some thief dude which is evil.
And the key to my theory.... Multi-type attack and we get two starters, so we can cover our ultimate disadvantage (should we choose.)