I mean its a 96% lucky togekiss, i'd max that even if it didnt have dragon hidden power.
Could be good against palkia with double dragon moves, and cloudy weather is seemingly very common.
As a dragon counter, its DPS is about 18 outside of weather boost, compared to the 26 which rayquaza has, but Togekiss has hands down the highest TDO of anything that hits palkia for super effective damage. Around three times that or rayquaza, I'd say it fits for a fantastic dragon counter.
In cloudy weather, charge beam gardevoir jumps above togekiss, but only by .3 DPS, both at 20.4 and 20.7 respectively, but togekiss still out TDO's gardevoir, and confusion gardevoir always lags behind togekiss. I'd say take the togekiss, cheaper, better TDO for not much DPS loss in weather boost, while its the best of the fairies outside boost.