#17 - Adding Sharpedo!
The ultimate hybrid is a Bewear with Diancie's head, Walrein's beard thing, Staraptor's crazy hairstyle, Chikorita's head leaf, Accelgor's mask, along with Charizard's draconic wings and Eevee's luxurious tail! Not to mention it also has two pairs of eyes (from Stunfisk and Xatu, respectively), with each pair having Darmanitan's flaming eyebrows! But that's not all. This behemoth also has Krookodile's jaw, Dodrio's bird legs, Flygon's claws, Groudon's feet, Dusclops' hands, Sharpedo's shark fins...
Side note: Once this hybrid is over, I might tweak the rules of this game a bit to add a little more flexibility. For now, I'm thinking of making it so that anyone is allowed to end a hybrid and start a new one anytime after #10, because that's when it starts to get much harder to know what not to add, haha. (Like, we might accidentally give a hybrid both Mewtwo's face AND Rayquaza's face, if you get what I'm saying. xD) Of course, the hybrid will still naturally be allowed to go beyond #10, with 20 being the maximum. Does that sound alright? If anyone has any objections or suggestions, feel free to say so!