Two really bad Y!Tiki

Ye they suck....but wait till her weapon comes to see what will help her more. She might end up with a breath somewhat like myrrhs that are stat dependent so its hard to advise which one is better for now.

I'd say fo now go with +Hp/-Spd.

Tiki and dragons in general are better used as enemy phase units, and you're likely going to have to run Quick Riposte anyways. Also that way you're not sacrificing your physical bulk.

On a second note wait until her new weapon and refinement come out to see what it does, perhaps it may just help her quite a bit in that regard.

I'd say go with -def, taking a bane in speed will get her doubled 9/10, but building her speed with spd refine can help her mitigate that, since it's +HP it's most likely going to survive a hit.

At least none of them have -atk like mine

Kind of a weird idea I have from answering another question, but since Y.Tiki needs to be built almost from ground zero anyways you might try to figure out some funky, weird build that makes good use of one of those IVs. Like, +HP -def if you can somehow inflate her speed a lot that suddenly turns into mixed bulk, iono give her light breath refined for speed (light breath also hits harder) and L&D now suddenly you have 29 mixed defenses and 43 speed (30 base + 5 for L&D + 3 from weapon + 5 buff, before seal or team support) to support 49 HP, so she'll be hard to double and hard to panic, and we can still add close def seal or something (though you might want windsweep+phantom spd or something like that). Or you can put dark breath and your 38 speed functions like 45, and you have 31 mixed defenses and also sit on 49 HP. Add vengeance or, under the right conditions/support, miracle, and you'll really throw people for a loop.

But first let's see how the new weapon works. Might play into something I suggested there.