I'll give you some ideas and commentary on how to approach building your Tiki, but realize that in the end, it is ultimately you that decides the IV spread that is the best for your team. (I should warn you: As of late, a lot of the regulars here have expressed frustration in seeing IV posts everyday about Sum!Y!Tiki--really, any of the Summer units and other top-Tier units--, and I, myself, do not want to have to constantly deal with these posts.)
Now, +Def / -Res is really good if you only want to make her a Physically defensive wall. I think this is a viable option if you want to run her in Flier Emblem teams because a lot of Fliers tend to have low Physical bulk, but really, she can be used in teams where you lack good Physical walls. Her naturally high Spd, in conjunction with something like Hone Fliers or Goad Fliers is very great at avoiding doubles and even doubling herself. You can even run Quick Riposte with this IV spread to guarantee that she doubles and take little damage against even fast Sword units like Ayra and Karla, while also preventing them from doubling your Tiki. With this set, I highly suggest against using Distant Counter because she does have that superboon in Res and won't be able to tank Magic attacks reliably. Also keep in mind that she won't be able to deal with Dragons too well, so you might not be able to fully utilize the built-in Dragon-slaying effect.
+Res / -HP is great if you want a Mixed bulk Tiki. Unlike the previous IV spread, this one can run Distant Counter well with her 29 Res, especially after receiving Fortify or Tactic buffs, but she doesn't need to run it to perform well. With higher Res, she is quite capable of dealing with Dragons more effectively, mainly Myrrh and Grima, and can make great use of the Dragon-slaying effect. She still has a lot of Spd, so the above set-up still works for this one. As for teams, I think this one is slightly more flexible because she can be used to tank both sources of damage, or if you really need a Dragon counter.
Hopefully, you can take some of this knowledge with you to make some of these decisions yourself in the future! ^.^
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