No no no no. No new types! Whoever made that chart is really stretching. For example, claiming that claiming that Yveltal is based on a Wyvern is pure conjecture. Nothing anywhere says that and it doesn't even look that much like a conventional wyvern (which typically have ropy tails, a reptilian appearance and 4 clawed feet). Yveltal has much more in common with birds than Wyverns. The only reason to make it sound type is to put it opposite of a Light type Xerneas.
It's just some BS fantasy theory.
And I really shouldn't need to go over again why adding new types would play absolute havoc with the type chart that's been well established for 4 straight generations now. If Gamefreak was going to add more types, they would have by now.