91% Lucky Togekiss (15A) but fighting hidden power

Fighting is interesting, gives you coverage against ice-rock-steel, all of which hit Togekiss back for super-effective damage.

I'd keep my candies till we learn everything about PvP mechanics and 2nd move. If it turns out you need type coverage for PvP, it could be an interesting choice

Fighting or Fire is probably the best you can wish for for PvP, as it looks like the meta will be dominated by Steel types.

Nevertheless, due to the fact above, it doesn't look like Fairies will do well in such a meta.

I'd say keep it as is for now, fighting will do good as a tyrnatiar counter in PvP, and if the opponent has bite as a fast move, the battle will heavily go in togekiss' favor. I'd suggest waiting until we know more about PvP before doing anything.