-Spd / +Res Summer Y! Tiki

The probabilities on 15 orbs are extremely poor. If you want to work with the current IV, the res is good for securing matchups against blue dragons. She'll need QR on 33 speed. DC + Iote's is an option in a flier team where you can push her speed to block doubles. I don't like her chances taking multiple hits from anything because her HP isn't very thick. Atk/def bond is perfectly fine, especially with close def seal.

While that is an unfortunate IV by many standards, it is not unsalvageable as this new tiki is basically an armored unit in BST. While the super bane is harsh, she is still a spectacular red dragon, in fact she is still the best red dragon even when accounting for your IVs. I would say that if you can afford the distant Counter, it could still be an excellent skill especially since she will tank mages pretty well as she also has access to flier and dragon buffs to account for her slower speed. Your tiki is an optimal tank and considering how her weapon works(like a breath skill in terms of special charge) -spd can be made into a weapon with her throwing out specials like moonbow on retaliation and even something with a 5 turn cooldown on her second retaliation with quick Riposte, which is probably my highest recommended skill for this unit. QR3 can make her into a flier tank which no other tiki could come close to competing with.

As a side note, please keep those orbs and wait for another banner or maybe CYL 2 before considering using them. This banner had 26 days still which is plenty of time. Figure out a build for your current tiki and save up some orbs as the new banners may be even better than the perfect S!Y!Tiki. Be patient, you have time.