8
On the only bug line of X/Y: Suspects a two-fold issue.
1. Created only 72 new Pokemon, including the mythicals. Inevitably winds up with some shortfalls between 18 types. Added only 2 Poison-types (Skrelp and Dragalge). Wound up low on Ice (Amaura, Aurorus, Bergmite, and Avalugg), Electric (Helioptile, Heliolisk, and Dedenne), and Ground (Diggersby and Zygarde).
2. Introduced Fairy-types. Needed to populate that. Solved some of that by counting old ones as Fairy.

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