Maxxy said:
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First of all, Swampert was Water/Ground (4x weak to Grass), so it's not unprecedented.
I chose Grass/Steel because of the prominent claws and the natural bulk of the design of Quilladin, along with the name referencing the "quills", which evoke the idea of steel in my mind. I chose the secondary typings on the basis of the designs, as I said - Braixen looks like it's getting daintier and ethereal, hence Fairy (besides, what better way to introduce the typing than to have it on one of the starter trio), and Frogadier looks like an aerodynamic frog with clouds, hence Flying.