Tiki...

If you play my style (and I'm not sure if you do; I'm the type that likes mobility and flexibility and dual phase and hates getting doubled), +spd is the ideal boon if there's enough spd buffing going on (goad fliers, for instance) and a chill spd on the team. I prefer def bane and def bane only because I want her magical bulk intact and her atk unscathed so I can OHKO enemy dragons.

However, among the choices you have there, it's a question of how passive you're willing to be. +def -atk is good if tanking is your first priority by a large margin; it's not a nice IV for her dragon matchups. +atk -spd cuts out a lot of her player phase, the major exception being her matchups against any non-blue dragon.

My regular young Tiki is also -Atk and she still do really well with Breath of Fog, which has 16 might and solve somehow the bad bane. I would chose the -Atk one, but the last choice is yours.

My regular young Tiki is also -Atk and she still do really well with Breath of Fog, which has 16 might and solve somehow the bad bane. I would chose the -Atk one, but the last choice is yours.