i first started with dd gyara with crunch>ice fang because it was a great threat in oras. it is the cleaner of the team and it can set up on lots of pokes in the meta. for clef i wanted to use a cm stored power set as it would help at stallbreaking and kill venusaur for gyarados. so the core i used was meant to break for each other and both being great wincons.
with the given core, they both seemed weak to steels like skarmory and ferrothorn. scarf mag seemed logical as it can trap steels, and check fast threats like jolly talonflame, greninja and weavile unlike zone.
the team seemed very weak to things like thundurus, opposing mag and using landog would help out and also resist the fighting weakness the team had. this mon helps me revenge fast electircs, while setting up rocks.(evs to outspeed fast 145s like sceptile and 150s like aero.)
the team was missing out on something to check keldeo and the team was hurt very badly by rocks because of the volt-turn combo and gyara. latias was a great fit as it could check it many spatkers like lando-i, thund-i, keldeo and zard-y for the team and of course, defog. healing wish was the main selling point of latias so it can restore gyara's health.
in the end the team was p good but it had a gaping weakness to ice + fighting moves. azu surves as the glue and i added it to finish off the lati +azu core. it also takes on many of the spatking mons lati deals with so if it dies, i still have smth to deal with them.